# WASP-103

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**WASP-103** is an [F-type main-sequence star](/source/F-type_main-sequence_star) located 1,800 ± 100 [light-years](/source/Light-year) (550 ± 30 [parsecs](/source/Parsec)) away in the constellation [Hercules](/source/Hercules_(constellation)). Its [surface temperature](/source/Effective_temperature) is 6,110 ± 160 kelvins (K). The star's [concentration of heavy elements](/source/Metallicity) is similar to that of the [Sun](/source/Sun).[1] WASP-103 is slightly younger than the Sun at 4 billion years.[1] The chromospheric activity of the star is elevated due to interaction with the giant planet on a close-in orbit.[2]

A multiplicity survey in 2015 found a suspected stellar companion to WASP-103, at a projected separation of 0.242 ± 0.016 ″.[3]

## Planetary system

In 2014 one [super-Jupiter](/source/Super-Jupiter) planet, named [WASP-103b](/source/WASP-103b), was discovered by the [transit method](/source/Transit_(astronomy)).[4] The planet is orbiting its host star in 22 hours and may be close to the limit of tidal disruption.[5] Orbital decay was not detected by 2020.[6] In early 2022, the planet was popularized because of its shape similar to a [potato](/source/Potato).[7]

The planetary atmosphere contains water, and possibly [hydrogen cyanide](/source/Hydrogen_cyanide), [titanium(II) oxide](/source/Titanium(II)_oxide), or [sodium](/source/Sodium).[8] The planet has an elevated carbon to oxygen molar fraction of 0.9[9] or 1.35, therefore it is nearly certain to be a [carbon planet](/source/Carbon_planet).[10]

Though the planetary equilibrium temperature is 2,484 ± 67 K, the planet is [tidally locked](/source/Tidally_locked) to WASP-103 and has one side in permanent day and the other side in permanent night. A significant temperature difference exists between the night side and day side; the dayside temperature is 2,930 ± 40 K, while the night side temperature is 1,880 ± 40 K.[9]

## References

1. Bonomo, A. S. et al. (2017). "The GAPS Programme with HARPS-N at TNG". *Astronomy & Astrophysics*. **602**: A107. [arXiv:1704.00373](https://arxiv.org/abs/1704.00373). [Bibcode:2017A&A...602A.107B](https://ui.adsabs.harvard.edu/abs/2017A%26A...602A.107B). [doi:10.1051/0004-6361/201629882](https://doi.org/10.1051/0004-6361/201629882). [S2CID 118923163](https://api.semanticscholar.org/CorpusID:118923163)

1. Staab, D.; Haswell, C. A.; Smith, Gareth D.; Fossati, L.; Barnes, J. R.; Busuttil, R.; Jenkins, J. S. (2017). "SALT observations of the chromospheric activity of transiting planet hosts: Mass-loss and star–planet interactions". *Monthly Notices of the Royal Astronomical Society*. **466** (1): 738–748. [arXiv:1612.01739](https://arxiv.org/abs/1612.01739). [Bibcode:2017MNRAS.466..738S](https://ui.adsabs.harvard.edu/abs/2017MNRAS.466..738S). [doi:10.1093/mnras/stw3172](https://doi.org/10.1093/mnras/stw3172)

1. Wöllert, Maria & Brandner, Wolfgang (2015). "A Lucky Imaging search for stellar sources near 74 transit hosts". *Astronomy & Astrophysics*. **579**: A129. [arXiv:1506.05456](https://arxiv.org/abs/1506.05456). [Bibcode:2015A&A...579A.129W](https://ui.adsabs.harvard.edu/abs/2015A%26A...579A.129W). [doi:10.1051/0004-6361/201526525](https://doi.org/10.1051/0004-6361/201526525). [S2CID 118903879](https://api.semanticscholar.org/CorpusID:118903879)

1. Southworth, John; Mancini, L.; Ciceri, S.; Budaj, J.; Dominik, M.; Figuera Jaimes, R.; Haugbølle, T.; Jørgensen, U. G.; Popovas, A.; Rabus, M.; Rahvar, S.; von Essen, C.; Schmidt, R. W.; Wertz, O.; Alsubai, K. A.; Bozza, V.; Bramich, D. M.; Calchi Novati, S.; d'Ago, G.; Hinse, T. C.; Henning, Th.; Hundertmark, M.; Juncher, D.; Korhonen, H.; Skottfelt, J.; Snodgrass, C.; Starkey, D.; Surdej, J. (2015). "High-precision photometry by telescope defocusing – VII. The ultrashort period planet WASP-103★". *Monthly Notices of the Royal Astronomical Society*. **447** (1): 711–721. [arXiv:1411.2767](https://arxiv.org/abs/1411.2767). [Bibcode:2015MNRAS.447..711S](https://ui.adsabs.harvard.edu/abs/2015MNRAS.447..711S). [doi:10.1093/mnras/stu2394](https://doi.org/10.1093/mnras/stu2394)

1. Gillon, M.; Anderson, D. R.; Collier-Cameron, A.; Delrez, L.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smith, A. M. S.; Smalley, B.; Southworth, J.; Triaud, A. H. M. J.; Udry, S.; Van Grootel, V.; West, R. G. (2014). "WASP-103 b: A new planet at the edge of tidal disruption". *Astronomy & Astrophysics*. **562**: L3. [arXiv:1401.2784](https://arxiv.org/abs/1401.2784). [Bibcode:2014A&A...562L...3G](https://ui.adsabs.harvard.edu/abs/2014A%26A...562L...3G). [doi:10.1051/0004-6361/201323014](https://doi.org/10.1051/0004-6361/201323014). [S2CID 53680974](https://api.semanticscholar.org/CorpusID:53680974)

1. Patra, Kishore C.; Winn, Joshua N.; Holman, Matthew J.; Gillon, Michael; Burdanov, Artem; Jehin, Emmanuel; Delrez, Laetitia; Pozuelos, Francisco J.; Barkaoui, Khalid; Benkhaldoun, Zouhair; Narita, Norio; Fukui, Akihiko; Kusakabe, Nobuhiko; Kawauchi, Kiyoe; Terada, Yuka; Bouma, L. G.; Weinberg, Nevin N.; Broome, Madelyn (2020). "The Continuing Search for Evidence of Tidal Orbital Decay of Hot Jupiters". *The Astronomical Journal*. **159** (4): 150. [arXiv:2002.02606](https://arxiv.org/abs/2002.02606). [Bibcode:2020AJ....159..150P](https://ui.adsabs.harvard.edu/abs/2020AJ....159..150P). [doi:10.3847/1538-3881/ab7374](https://doi.org/10.3847/1538-3881/ab7374). [S2CID 211066260](https://api.semanticscholar.org/CorpusID:211066260)

1. ["Astronomers Discover Planet That Looks Like a Rugby Ball"](https://gadgets360.com/science/news/planet-potato-rugby-ball-wasp-103b-astronomer-host-sun-proximity-esa-nasa-hubble-2709321). *NDTV Gadgets 360*. 15 January 2022. Retrieved 2022-02-19.

1. Wilson, Jamie; Gibson, Neale P.; Nikolov, Nikolay; Constantinou, Savvas; Madhusudhan, Nikku; Goyal, Jayesh; Barstow, Joanna K.; Carter, Aarynn L.; De Mooij, Ernst J W.; Drummond, Benjamin; Mikal-Evans, Thomas; Helling, Christiane; Mayne, Nathan J.; Sing, David K. (2020). "Ground-based transmission spectroscopy with FORS2: A featureless optical transmission spectrum and detection of H2O for the ultra-hot Jupiter WASP-103b". *Monthly Notices of the Royal Astronomical Society*. **497** (4): 5155–5170. [arXiv:2007.13510](https://arxiv.org/abs/2007.13510). [Bibcode:2020MNRAS.497.5155W](https://ui.adsabs.harvard.edu/abs/2020MNRAS.497.5155W). [doi:10.1093/mnras/staa2307](https://doi.org/10.1093/mnras/staa2307)

1. Kreidberg, Laura; Line, Michael R.; Parmentier, Vivien; Stevenson, Kevin B.; Louden, Tom; Bonnefoy, Mickäel; Faherty, Jacqueline K.; Henry, Gregory W.; Williamson, Michael H.; Stassun, Keivan; Beatty, Thomas G.; Bean, Jacob L.; Fortney, Jonathan J.; Showman, Adam P.; Désert, Jean-Michel; Arcangeli, Jacob (2018). "Global Climate and Atmospheric Composition of the Ultra-hot Jupiter WASP-103b fromHSTandSpitzer *Phase* Curve Observations". *The Astronomical Journal*. **156** (1): 17. [arXiv:1805.00029](https://arxiv.org/abs/1805.00029). [Bibcode:2018AJ....156...17K](https://ui.adsabs.harvard.edu/abs/2018AJ....156...17K). [doi:10.3847/1538-3881/aac3df](https://doi.org/10.3847/1538-3881/aac3df). [S2CID 56157823](https://api.semanticscholar.org/CorpusID:56157823)

1. Shi, Yaqing; Wang, Wei; Zhao, Gang; Zhai, Meng; Chen, Guo; Jiang, Zewen; Ouyang, Qinglin; Henning, Thomas; Zhao, Jingkun; Crouzet, Nicolas; Van Boekel, Roy; Esteves, Lisa (2023), "Thermal emission from the hot Jupiter WASP-103 b in *J* and *K* s bands", *Monthly Notices of the Royal Astronomical Society*. **522**: 1491–1503, [arXiv:2303.13732](https://arxiv.org/abs/2303.13732). [doi:10.1093/mnras/stad891](https://doi.org/10.1093/mnras/stad891)

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Adapted from the Wikipedia article [WASP-103](https://en.wikipedia.org/wiki/WASP-103) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/WASP-103?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.