{{Short description|Star in the constellation Draco}} {{Starbox begin}} {{Starbox observe | epoch = [[J2000]] | constell = [[Draco (constellation)|Draco]]<ref>{{cite web |url=http://djm.cc/constellation.html |title=Finding the constellation which contains given sky coordinates |date=2 August 2008 |website=djm.cc |access-date=11 December 2023 |archive-date=15 August 2019 |archive-url=https://web.archive.org/web/20190815143107/http://djm.cc/constellation.html |url-status=live }}</ref> | ra = {{RA|12|48|44.37261}}<ref name="GaiaDR3"/> | dec = {{DEC|+64|51|19.1475}}<ref name="GaiaDR3"/> | appmag_v = 9.534<ref name="Dai2023"/> }} {{Starbox character | type = [[Main sequence]]<ref name="GaiaDR3"/> | class = G5<ref name="SIMBAD"/> | appmag_1_passband = B | appmag_1 = {{val|10.16|0.03}}<ref name="SIMBAD"/> | appmag_2_passband = V | appmag_2 = {{val|9.534|0.003}}<ref name="Dai2023"/> | appmag_3_passband = G | appmag_3 = {{val|9.376|0.003}}<ref name="GaiaDR3"/> | appmag_4_passband = J | appmag_4 = {{val|8.363|0.020}}<ref name="SIMBAD"/> | appmag_5_passband = H | appmag_5 = {{val|8.088|0.018}}<ref name="SIMBAD"/> | appmag_6_passband = K | appmag_6 = {{val|8.034|0.021}}<ref name="SIMBAD"/> }} {{Starbox astrometry | radial_v = {{val|7.51|0.20}}<ref name="GaiaDR3"/> | prop_mo_ra = 1.216 | prop_mo_dec = -10.045 | pm_footnote = <ref name="GaiaDR3"/> | parallax = 11.8236 | p_error = 0.0108 | parallax_footnote = <ref name="GaiaDR3"/> | absmag_v = | absmag_bol = }} {{Starbox detail | source = <ref name="Dai2023"/> | mass = {{val|1.022|0.027}} | radius = {{val|0.968|0.036}} | luminosity_bolometric = | gravity = {{val|4.47|0.04}} | temperature = {{val|5770|50}} | metal_fe = {{val|0.07|0.06}} | rotation = {{val|8.42|0.09|ul=d}}<ref name="Beard2024"/> | rotational_velocity = {{val|6.7|0.6}} | age_myr = {{val|700|150}} }} {{Starbox catalog | names = {{odlist | 2MASS = J12484436+6451191 | BD = +65 902 | GSC = 04165-00581 | PPM = 18379 | SAO = 15908 | TIC = 142276270 | TOI = 1136 | TYC = 4165-581-1}}<ref name="SIMBAD"/> }} {{Starbox reference | Simbad = TOI-1136 | NSTED = TOI-1136 }} {{Starbox end}} [[File:TOI-1136 system.jpg|thumb|Artist's impression of known planets in the TOI-1136 system and their size comparison with Earth and Neptune]]
'''TOI-1136''' is a [[G-type main-sequence star]] {{convert|276|ly|pc|lk=on|abbr=off}} away in the constellation [[Draco (constellation)|Draco]]. It is slightly smaller than the [[Sun]] and similar in mass and temperature, but is much younger, with an age of about 700 million years. It hosts a system of at least six, and possibly seven, [[exoplanet]]s.<ref name="Dai2023"/> ==Planetary system== TOI-1136 was discovered to have six [[Methods of detecting exoplanets#Transit photometry|transiting]] planets in 2022 using the [[Transiting Exoplanet Survey Satellite]] (TESS), all orbiting closer to their star than [[Mercury (planet)|Mercury]] is to the Sun.<ref name="Dai2023"/> All of them are Neptune-sized or [[mini-Neptune]]s, and their masses have been measured using a combination of [[Methods of detecting exoplanets#Radial velocity|radial velocity]] and [[transit-timing variation]]s, showing them to have low densities.<ref name="Beard2024"/> The planets are in an [[orbital resonance]], with period ratios near 3:2, 2:1, 3:2, 7:5, and 3:2.<ref name="Dai2023"/>
A possible single transit of a seventh planet was also identified. This candidate planet would also be sub-Neptune-sized, but its orbit is poorly constrained. If this is confirmed, it would make TOI-1136 one of the most populous known planetary systems.<ref name="Beard2024"/>
{{Orbitbox planet begin | table_ref = <ref name="Dai2023"/><ref name="Beard2024"/> }} {{Orbitbox planet | exoplanet = b | mass_earth = {{val|3.50|0.8|0.7}} | radius_earth = {{val|1.90|0.21|0.15}} | semimajor = {{val|0.05106|0.0009|fmt=none}} | period = {{val|4.1727|0.0003}} | eccentricity = {{val|0.027|0.009}} | inclination = {{val|86.44|0.27|0.21}} }} {{Orbitbox planet | exoplanet = c | mass_earth = {{val|6.32|1.1|1.3}} | radius_earth = {{val|2.879|0.060|0.062}} | semimajor = {{val|0.0669|0.0005}} | period = {{val|6.2574|0.0002}} | eccentricity = {{val|0.11|0.01}} | inclination = {{val|89.42|0.39|0.55}} }} {{Orbitbox planet | exoplanet = d | mass_earth = {{val|8.35|1.8|1.6}} | radius_earth = {{val|4.627|0.077|0.072}} | semimajor = {{val|0.1062|0.0008}} | period = {{val|12.5199|0.0004}} | eccentricity = {{val|0.042|0.004}} | inclination = {{val|89.41|0.28}} }} {{Orbitbox planet | exoplanet = e | mass_earth = {{val|6.07|1.09|1.01}} | radius_earth = {{val|2.639|0.072|0.088}} | semimajor = {{val|0.139|0.002}} | period = {{val|18.801|0.001}} | eccentricity = {{val|0.0425|0.004}} | inclination = {{val|89.31|0.26|0.18}} }} {{Orbitbox planet | exoplanet = f | mass_earth = {{val|9.7|3.9|3.7}} | radius_earth = {{val|3.88|0.11}} | semimajor = {{val|0.174|0.002}} | period = {{val|26.321|0.001}} | eccentricity = {{val|0.001|0.001}} | inclination = {{val|89.38|0.22|0.17}} }} {{Orbitbox planet | exoplanet = g | mass_earth = {{val|5.6|4.1|3.2}} | radius_earth = {{val|2.53|0.11|0.12}} | semimajor = {{val|0.229|0.003}} | period = {{val|39.545|0.002}} | eccentricity = {{val|0.04|0.01}} | inclination = {{val|89.65|0.18|0.13}} }} {{Orbitbox planet hypothetical | exoplanet = h | mass_earth = <18.8 | radius_earth = {{val|2.68|0.20|0.18}} | semimajor = ~0.36 | period = ~77 | eccentricity = {{val|0.04|0.05|0.03}} | inclination = {{val|89.68|0.02}} }} {{Orbitbox end}}
==See also== * [[HD 110067]] * [[Kepler-90]] * [[Kepler-385]] * [[TOI-178]] * [[TRAPPIST-1]]
==References== <references>
<ref name="SIMBAD">{{cite simbad |title=TOI-1136 |access-date=10 December 2023}}</ref>
<ref name="GaiaDR3">{{Cite Gaia DR3|1677343097418015488}}</ref>
<ref name="Dai2023">{{cite journal |last1=Dai |first1=Fei |last2=Masuda |first2=Kento |display-authors=etal |date=February 2023 |title=TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain |journal=[[The Astronomical Journal]] |volume=165 |issue=2 |pages= |doi=10.3847/1538-3881/aca327 |doi-access=free |arxiv=2210.09283 |bibcode=2023AJ....165...33D}}</ref>
<ref name="Beard2024">{{cite journal |last1=Beard |first1=Corey |last2=Robertson |first2=Paul |display-authors=etal |date=February 2024 |title=The TESS-Keck Survey XVII: Precise Mass Measurements in a Young, High Multiplicity Transiting Planet System using Radial Velocities and Transit Timing Variations |journal=[[The Astronomical Journal]] |volume=167 |issue=2 |pages= |doi=10.3847/1538-3881/ad1330 |doi-access=free |arxiv=2312.04635 |bibcode=2024AJ....167...70B}}</ref>
</references>
{{Draco (constellation)}}
[[Category:Draco (constellation)]] [[Category:G-type main-sequence stars]] [[Category:Planetary systems with six confirmed planets]] [[Category:Durchmusterung objects|BD+65 0902]] [[Category:TESS Objects of Interest|1136]]