{{Short description|Star in the constellation Centaurus}} {{Starbox begin}} {{Starbox image | image= {{Location mark |image=Centaurus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=8|mark_link=HD 114613 |x=602|y=344 }} |caption=Location of HD 114613 (circled) }} {{Starbox observe | epoch = J2000.0 | constell = [[Centaurus]]<ref name=constellation/> | ra = {{RA|13|12|03.18430}}<ref name="GaiaDR3"/> | dec = {{DEC|-37|48|10.8799}}<ref name="GaiaDR3"/> | appmag_v = {{val|4.852|0.011}}<ref name="Hog2000"/> }} {{Starbox character | type = [[subgiant]]<ref name="GaiaDR3"/> | class = G4 IV<ref name=gray/> | b-v = {{val|0.659|0.020}}<ref name="Hog2000"/> }} {{Starbox astrometry | radial_v = {{val|-13.03|0.13}}<ref name="GaiaDR3"/> | prop_mo_ra = −382.409 | prop_mo_dec = −46.147 | pm_footnote = <ref name="GaiaDR3"/> | parallax = 48.8691 | p_error = 0.1058 | parallax_footnote = <ref name="GaiaDR3"/> | absmag_v = 3.29<ref name=pace/> }} {{Starbox detail | mass = {{val|1.25|0.03}}<ref name="Takeda2007"/> | radius = {{val|2.01|0.06}}<ref name="Takeda2007"/> | luminosity = {{val|4.057|0.014}}<ref name="Sousa08"/> | gravity = {{val|3.97|0.02}}<ref name="Sousa08"/> | temperature = {{val|fmt=commas|5729|17}}<ref name="Sousa08"/> | metal_fe = {{val|0.19|0.01}}<ref name="Sousa08"/> | rotation = {{val|34.1|3.5|ul=days}}<ref name="Lovis2011"/> | rotational_velocity = {{val|2.4|0.5}}<ref name="Valenti2005"/> | age_gyr = {{val|5.20|0.24}}<ref name="Takeda2007"/> }} {{Starbox catalog | names = {{odlist|CD=-37°8437|FK5=3051|GJ=501.2|HD=114613|HIP=64408|HR=4979|SAO=204227}} }} {{Starbox reference | Simbad = HD+114613 }} {{Starbox end}}
'''HD 114613''' ('''Gliese 501.2''') is a fifth magnitude yellow [[subgiant]] star that lies {{convert|66.7|ly|pc|lk=on|abbr=off}} away in the [[constellation]] of [[Centaurus]].
== Stellar characteristics == {{Location mark |image=HRDiagram.png|alt=|float=left|width=260 |label=|position=right |mark=Chess tile xg.svg|mark_width=16|mark_link=HD 114613 |x=420|y=530 }} HD 114613 lies about two degrees south-east of [[Iota Centauri]], towards the middle of Centaurus. Though it is fairly easily observable with the naked eye, the star does not have a [[Bayer designation|Bayer]] or [[Flamsteed designation|Flamsteed]] designation as the constellation of Centaurus contains many brighter stars.
The B-V colour and spectroscopic temperature of HD 114613 correspond with its spectral type of G4. This means that the star is only slightly cooler than the Sun, and has the yellow hue typical of G-type stars. On the [[Hertzsprung-Russell diagram]] (left) the star lies significantly above the main sequence, and is close to the [[subgiant]] branch; this means that HD 114613 has depleted the hydrogen in its core through [[nuclear fusion]], and is increasing in radius while decreasing in temperature as it moves towards the giant branch.
As HD 114613 is ending hydrogen fusion, the star must be fairly old. When combined with a spectroscopically derived mass of {{Solar mass|1.25 ± 0.03}} and a surface gravity of log 3.95 ± 0.03 g the implied age of the star is 5.20 ± 0.24 billion years,<ref name="Takeda2007"/> making it slightly older than the Sun. Though stellar metallicities typically decrease with increasing stellar age, within the age range of the [[thin disk]] a wide range of metallicities are common; HD 114613's high iron abundance of 0.19 ± 0.01 dex (155 ± 4% of the solar abundance) is therefore not unusual. The rate of giant planet occurrence for Fe/H = 0.2 dex stars is about 15%,<ref name="Mortier2013"/> which makes it fairly unsurprising that the star could host a giant planet.
HD 114613 has a magnetic cycle with a period of 897 ± 61 days, about four-and-a-half times shorter than the [[Solar cycle|Solar magnetic cycle]] and one of the shortest magnetic cycles known.<ref name="Lovis2011"/>
== Planet searches == Being bright and solar-type, HD 114613 is an attractive target for [[Doppler spectroscopy|radial velocity (RV)-based planet searches]].
HD 114613 was one of the 37 targets of the first RV-based planet search in the southern hemisphere, the [[ESO]]-CES survey that spanned between 1992 and 1998.<ref name="Endl2002"/> This survey did not detect any companion with several Jovian masses out to a few AU. An extension of this survey to the [[High Accuracy Radial Velocity Planet Searcher|HARPS]] spectrograph provides further constraint, suggesting that there are no Jupiter-mass companions out to about 5 AU.<ref name="Zechmeister2013"/>
HD 114613 is included in the samples of the ESO-[[CORALIE spectrograph|CORALIE]]<ref name="Mortier2013"/> and [[Anglo-Australian Telescope|AAT]]-UCLES<ref name="Jones2002"/> planet searches that both began in 1998. Seemingly finding the star to be RV-stable and suitable for higher precision, HD 114613 was included in a subset of the CORALIE sample that became the sample of the ESO-HARPS high precision planet search that began in 2004,<ref name="Sousa08"/> while the star was elevated in importance in the AAT sample in 2005.<ref name="Wittenmyer2010"/><ref name="Wittenmyer2011"/> Though apparently not included in its main sample, HD 114613 is included in the sample of the [[W. M. Keck Observatory|Keck]]-HIRES Eta-Earth low-mass planet search that also began in 2004.<ref name="Howard2010"/>
In Wittenmyer et al. 2012,<ref name="Wittenmyer2012"/> HD 114613 is indicated to be a low-mass planet host. Though this references a Tuomi et al. 2012 (''Tuomi, M., et al. 2012, MNRAS, submitted''), no such paper was published that year. More recently, in a Tuomi et al. 2013,<ref name=Tuomi2013/> [[Tau Ceti]] is noted to have a similar activity index distribution to HD 114613. Again, a Tuomi et al. 2012 is referenced, though somewhat more completely (''Tuomi, M., Jones, H. R. A., Jenkins, J. S., et al. 2012, MNRAS, submitted''). No paper announcing HD 114613 as a ''low-mass'' planet host has been published as of 2014.
However, that does not mean the star is not a planet host. Wittenmyer et al. (2014) found HD 114613 to show a moderate-amplitude variation in its radial velocity with a period of 10.5 years, indicative of a long-period companion.<ref name="Wittenmyer2014"/> The radial velocity semi-amplitude of 5.5 m/s translates to a planet with a minimum mass about half a Jupiter mass. The planet has an intermediate orbital eccentricity of 0.25, which means that it can be somewhat loosely considered a Jupiter analogue.
A study in 2023 did not detect this radial velocity signal, but instead detected a signal with a longer period of about 18 years, which shows indications of originating from a long-period magnetic activity cycle. This suggests that the previously detected signal is not planetary, but is related to stellar activity.<ref name="Laliotis2023"/>{{rp|28}}<ref name="Laliotis2023"/>{{rp|44}}
==References== <references> <ref name="GaiaDR3">{{Cite Gaia DR3|6141742283401003264}}</ref>
<ref name=constellation>{{cite constellation|HD 114613}}</ref>
<ref name="Hog2000">{{cite journal | title=The Tycho-2 catalogue of the 2.5 million brightest stars | last1=Høg | first1=E. | last2=Fabricius | first2=C. | last3=Makarov | first3=V. V. | last4=Urban | first4=S. | last5=Corbin | first5=T. | last6=Wycoff | first6=G. | last7=Bastian | first7=U. | last8=Schwekendiek | first8=P. | last9=Wicenec | first9=A. | display-authors=1 | journal=Astronomy and Astrophysics | volume=355 | pages=27–30 | date=2000 | bibcode=2000A&A...355L..27H | doi=10.1888/0333750888/2862| isbn=0333750888 }}</ref>
<ref name="Takeda2007">{{cite journal | title=Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog | last1=Takeda | first1=Genya | last2=Ford | first2=Eric B. | last3=Sills | first3=Alison | last4=Rasio | first4=Frederic A. | last5=Fischer | first5=Debra A. | last6=Valenti | first6= Jeff A. | display-authors=1 | journal=The Astrophysical Journal Supplement Series | volume=168 | issue=2 | pages=297–318 | date=2007 | arxiv=astro-ph/0607235 | bibcode=2007ApJS..168..297T | doi=10.1086/509763 | s2cid=18775378 }}</ref>
<ref name=Sousa08>{{cite journal | author=Sousa, S. G. | title=Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes. | journal=Astronomy and Astrophysics | volume=487 | issue=1 |date=August 2008 | pages=373–381 | doi=10.1051/0004-6361:200809698 | bibcode=2008A&A...487..373S | display-authors=1 | last2=Santos | first2=N. C. | last3=Mayor | first3=M. | last4=Udry | first4=S. | last5=Casagrande | first5=L. | last6=Israelian | first6=G. | last7=Pepe | first7=F. | last8=Queloz | first8=D. | last9=Monteiro | first9=M. J. P. F. G. |arxiv = 0805.4826 | s2cid=18173201 }}</ref>
<ref name="Lovis2011">{{cite arXiv | title=The HARPS search for southern extra-solar planets. XXXI. Magnetic activity cycles in solar-type stars: statistics and impact on precise radial velocities | last1=Lovis | first1=C. | last2=Dumusque | first2=X. | last3=Santos | first3=N. C. | last4=Bouchy | first4=F. | last5=Mayor | first5=M. | last6=Pepe | first6=F. | last7=Queloz | first7=D. | last8=Ségransan | first8=D. | last9=Udry | first9=S. | display-authors=1 | date=2011 | eprint=1107.5325 |class=astro-ph.SR}}</ref>
<ref name="Valenti2005">{{cite journal | title=Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs | display-authors=1 | last1=Valenti | first1=J. A. | last2=Fischer | first2=D. A. | journal=The Astrophysical Journal Supplement Series | volume=159 | issue=1 | pages=141–166 | date=2005 | bibcode=2005ApJS..159..141V | doi=10.1086/430500 | doi-access=free }}</ref>
<ref name="Mortier2013">{{cite journal | title=On the functional form of the metallicity-giant planet correlation | last1=Mortier | first1=A. | last2=Santos | first2=N. C. | last3=Sousa | first3=S. | last4=Israelian | first4=S. | last5=Mayor | first5=M. | last6=Udry | first6=S. | display-authors=1 | journal=Astronomy & Astrophysics | volume=551 | date=2013 | arxiv=1302.1851 | bibcode=2013A&A...551A.112M | doi=10.1051/0004-6361/201220707 | pages=A112| s2cid=56350455 }}</ref>
<ref name="Endl2002">{{cite journal | title=The planet search program at the ESO Coudé Echelle spectrometer. III. The complete Long Camera survey results | last1=Endl | first1=M. | last2=Kürster | first2=M. | last3=Els | first3=S. | last4=Hatzes | first4=A. P. | last5=Cochran | first5=W. D. | last6=Dennerl | first6=K. | last7=Döbereiner | first7=S. | display-authors=1 | journal=Astronomy & Astrophysics | volume=392 | issue=2 | pages=671–690 | date=2002 | arxiv=astro-ph/0207512 | bibcode=2002A&A...392..671E | doi=10.1051/0004-6361:20020937 | s2cid=17393347 }}</ref>
<ref name="Zechmeister2013">{{cite journal | title=The planet search programme at the ESO CES and HARPS. IV. The search for Jupiter analogues around solar-like stars | last1=Zechmeister | first1=M. | last2=Kürster | first2=M. | last3=Endl | first3=M. | last4=Lo Curto | first4=G. | last5=Hartman | first5=H. | last6=Nilsson | first6=H. | last7=Henning | first7=T. | last8=Hatzes | first8=A. P. | last9=Cochran | first9=W. D. | display-authors=1 | journal=Astronomy & Astrophysics | volume=592 | date=2013 | arxiv=1211.7263 |bibcode = 2013A&A...552A..78Z | doi = 10.1051/0004-6361/201116551 | pages=A78| s2cid=53694238 }}</ref>
<ref name="Jones2002">{{cite journal | title=Extrasolar planets around HD 196050, HD 216437 and HD 160691 | last1=Jones | first1=Hugh R. A. | last2=Paul Butler | first2=R. | last3=Marcy | first3=Geoffrey W. | last4=Tinney | first4=Chris G. | last5=Penny | first5=Alan J. | last6=McCarthy | first6=Chris | last7=Carter | first7=Brad D. | display-authors=1 | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=337 | issue=4 | pages=1170–1178 | date=2002 | arxiv=astro-ph/0206216 | bibcode=2002MNRAS.337.1170J | doi=10.1046/j.1365-8711.2002.05787.x | doi-access=free | s2cid=119520409 }}</ref>
<ref name="Wittenmyer2010">{{cite journal | title=The Frequency of Low-mass Exoplanets. II. The "Period Valley" | last1=Wittenmyer | first1=Robert A. | last2=O'Toole | first2=Simon J. | last3=Jones | first3=H. R. A. | last4=Tinney | first4=C. G. | last5=Butler | first5=R. P. | last6=Carter | first6=B. D. | last7=Bailey | first7=J. | display-authors=1 | journal=The Astrophysical Journal | volume=722 | issue=2 | date=2010 | arxiv=1008.5232 | bibcode=2010ApJ...722.1854W | doi=10.1088/0004-637X/722/2/1854 | pages=1854–1863| s2cid=115317017 }}</ref>
<ref name="Wittenmyer2011">{{cite journal | title=The Frequency of Low-mass Exoplanets. III. Toward η<sub>🜨</sub> at Short Periods | last1=Wittenmyer | first1=Robert A. | last2=Tinney | first2=C. G. | last3=Butler | first3=R. P. | last4=O'Toole | first4=Simon J. | last5=Jones | first5=H. R. A. | last6=Carter | first6=B. D. | last7=Bailey | first7=J | last8=Horner | first8=J. | display-authors=1 | journal=The Astrophysical Journal | volume=738| issue=1 | date=2011 | arxiv=1103.4186 | bibcode=2011ApJ...738...81W | doi=10.1088/0004-637X/738/1/81 | pages=81| s2cid=19007954 }}</ref>
<ref name="Howard2010">{{cite journal | title=The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters | last1=Howard | first1=Andrew A. | last2=Marcy | first2=Geoffrey W. | last3=Johnson | first3=John Asher | last4=Fischer | first4=Debra A. | last5=Wright | first5=Jason T. | last6=Isaacson | first6=Howard | last7=Valenti | first7=Jeff A. | last8=Anderson | first8=Jay | last9=Lin | first9=Doug N. C. | last10=Ida | first10=Shigeru | display-authors=1 | journal=Science | volume=330 | issue=6004 | date=2010 | arxiv=1011.0143 | bibcode=2010Sci...330..653H | doi=10.1126/science.1194854 | pages=653–655 | pmid=21030652| s2cid=34792507 }}</ref>
<ref name="Wittenmyer2012">{{cite journal | title=The Anglo-Australian Planet Search. XXII. Two New Multi-planet Systems | last1=Wittenmyer | first1=Robert A. | last2=Horner | first2=J. | last3=Tuomi | first3=Mikko | last4=Salter | first4=G.S. | last5=Tinney | first5=C.G. | last6=Butler | first6=R.P. | last7=Jones | first7=H.R.A. | last8=O'Toole | first8=S.J. | last9=Bailey | first9=J. | last10=Carter | first10=B.D. | last11=Jenkins | first11=J.S. | last12=Zhang | first12=Z. | last13=Vogt | first13=S.S. | last14=Rivera| first14=Eugenio J. | display-authors=1 | journal=The Astrophysical Journal | volume=753 | issue=2 | pages=169 | date=2012 | arxiv=1205.2765 | bibcode=2012ApJ...753..169W | doi=10.1088/0004-637X/753/2/169 | s2cid=2941264 }}</ref>
<ref name="Tuomi2013">{{cite journal | title=Signals embedded in the radial velocity noise. Periodic variations in the τ Ceti velocities. | last1=Tuomi | first1=M. | last2=Jones | first2=H. R. A. | last3=Jenkins | first3=J. S. | last4=Tinney | first4=C. G. | last5=Butler | first5=R. P. | last6=Vogt | first6=S. S. | last7=Barnes | first7=J. R. | last8=Wittenmyer | first8=R. A. | last9=O'Toole | first9=S. | last10=Horner | first10=J. | last11=Bailey | first11=J. | last12=Carter | first12=B. D. | last13=Wright | first13=D. J. | last14=Salter | first14=G. S. | last15=Pinfield | first15=D. | display-authors=1 | journal=Astronomy & Astrophysics | volume=551 | date=2013 | arxiv=1212.4277 | bibcode=2013A&A...551A..79T | doi=10.1051/0004-6361/201220509 | pages=A79| s2cid=2390534 }}</ref>
<ref name="Wittenmyer2014">{{cite journal | title=The Anglo-Australian Planet Search. XXIII. Two New Jupiter Analogs | last1=Wittenmyer | first1=Robert A. | last2=Horner | first2=Jonathan | last3=Tinney | first3=C.G. | last4=Butler | first4=R. P. | last5=Jones | first5=H.R.A. | last6=Tuomi | first6=Mikko | last7=Salter | first7=G.S. | last8=Carter | first8=B.D. | last9=Koch | first9=F. Elliot | last10=O'Toole | first10=S.J. | last11=Bailey | first11=J. | last12=Wright | first12= D. | display-authors=1 | journal=The Astrophysical Journal | date=2014 | arxiv=1401.5525 |bibcode = 2014ApJ...783..103W |doi = 10.1088/0004-637X/783/2/103 | volume=783 | issue=2 | pages=103| s2cid=14082923 }}</ref>
<ref name=gray>{{cite journal|bibcode=2006AJ....132..161G|title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample|journal=The Astronomical Journal|volume=132|pages=161–170|last1=Gray|first1=R. O.|last2=Corbally|first2=C. J.|last3=Garrison|first3=R. F.|last4=McFadden|first4=M. T.|last5=Bubar|first5=E. J.|last6=McGahee|first6=C. E.|last7=O'Donoghue|first7=A. A.|last8=Knox|first8=E. R.|year=2006|issue=1|doi=10.1086/504637|arxiv = astro-ph/0603770 |s2cid=119476992}}</ref>
<ref name=pace>{{cite journal|doi=10.1051/0004-6361:20030163|title=The Wilson–Bappu effect: A tool to determine stellar distances|journal=Astronomy & Astrophysics|volume=401|issue=3|pages=997–1008|year=2003|last1=Pace|first1=G.|last2=Pasquini|first2=L.|last3=Ortolani|first3=S.|bibcode=2003A&A...401..997P|arxiv = astro-ph/0301637 |s2cid=17029463}}</ref>
<ref name="Laliotis2023">{{cite journal |last1=Laliotis |first1=Katherine |last2=Burt |first2=Jennifer A. |display-authors=etal |date=February 2023 |title=Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions |journal=[[The Astronomical Journal]] |volume= 165|issue= 4|page=176 |doi= 10.3847/1538-3881/acc067|arxiv=2302.10310 |bibcode=2023AJ....165..176L |doi-access=free }}</ref> </references>
{{Stars of Centaurus}}
[[Category:Centaurus]] [[Category:Durchmusterung objects]] [[Category:Henry Draper Catalogue objects|114613]] [[Category:Hipparcos objects|064408]] [[Category:Bright Star Catalogue objects|4979]] [[Category:Gliese and GJ objects|0501.2]] [[Category:G-type subgiants]] [[Category:Gould objects|Centauri, 185]] [[Category:Hypothetical planetary systems]]