LP 791-18

LP 791-18
Observation data; Epoch J2000 Equinox J2000
Constellation	Crater[1]
Right ascension	11h 02m 45.95462s[2]
Declination	−16° 24′ 22.2882″[2]
Apparent magnitude (V)	16.9±0.2[3]
Characteristics
Evolutionary stage	Red dwarf (main sequence)
Spectral type	M6.1±0.7V[3]
Astrometry
Proper motion (μ)	RA: -221.291 mas/yr[2] ; Dec.: -58.841 mas/yr[2]
Parallax (π)	37.5225 ± 0.0392 mas[2]
Distance	86.92 ± 0.09 ly ; (26.65 ± 0.03 pc)
Details[3]
Mass	0.139±0.005 M☉
Radius	0.17±0.018 R☉
Temperature	2960±55 K
Metallicity [Fe/H]	-0.09±0.19 dex
Age	0.5±0.064 Gyr
Other designations
	LP 791-18, TOI-736, TIC 181804752, 2MASS J11024596-1624222[4]
Database references
SIMBAD	data

LP 791-18 (TOI-736) is a cool M dwarf star in the constellation Crater, located 26.65 parsecs (86.9 light-years) away from Earth.[3]

The star is one of the smallest known to host exoplanets.[5] In 2019 two exoplanets in transit around it were announced by TESS,[3] and a third planet was discovered in Spitzer Space Telescope data in 2023.[5]

Planetary system

Artist's impression of LP 791-18 d, with c in the background[6]

The innermost planet, b, is a super-Earth and the outermost planet, c, is a mini-Neptune. They were discovered together in 2019.[3] The middle planet, d, is an Earth-mass world discovered in 2023. It may potentially be tidally heated by interactions with planet c, which would lead to abundant volcanoes similar to Jupiter's moon Io.[5] As the planet d is in the inner edge of the habitable zone, liquid water could condense on the side of the planet that faces away from the host star.[6]

In 2021 planet c was suggested for atmospheric analysis by the James Webb Space Telescope.[7]

The LP 791-18 planetary system[5]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	—	0.00978±0.00012	0.9479981±0.0000021	—	88.37^+0.94 _−0.95°	1.212^+0.059 _−0.058 R_🜨
d	0.9^+0.5 _−0.4 M_🜨	0.01992±0.00014	2.753436±0.000013	0.0015±0.00014	89.34±0.41°	1.032^+0.044 _−0.043 R_🜨
c	7.1±0.7 M_🜨	0.02961^+0.00035 _−0.00036	4.9899093^+0.0000074 _−0.0000072	0.00008±0.00004	89.78±0.13°	2.438±0.096 R_🜨

References

"Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
Crossfield, Ian J. M.; Waalkes, William; Newton, Elisabeth R.; Narita, Norio; Muirhead, Philip; Ment, Kristo; et al. (2019). "A Super-Earth and Sub-Neptune Transiting the Late-type M Dwarf LP 791-18". The Astrophysical Journal Letters. 883 (1): L16. arXiv:1906.09267. Bibcode:2019ApJ...883L..16C. doi:10.3847/2041-8213/ab3d30.
"LP 791-18". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 May 2023.
Peterson, Merrin S; Benneke, Björn; Collins, Karen; Piaulet, Caroline; Crossfield, Ian JM; Ali-Dib, Mohamad; et al. (2023). "A temperate Earth-sized planet with tidal heating transiting an M6 star". Nature. 617 (7962): 701–705. doi:10.1038/s41586-023-05934-8. hdl:11603/28165. PMID 37198481.
Kazmierczak, Jeanette (16 May 2023). "NASA's Spitzer, TESS Find Potentially Volcano-Covered Earth-Size World". NASA. Retrieved 19 May 2023.
Phillips, Caprice L.; Wang, Ji; Kendrew, Sarah; Greene, Thomas P.; Hu, Renyu; Valenti, Jeff; Panero, Wendy R.; Schulze, Joseph (2021). "Detecting Biosignatures in the Atmospheres of Gas Dwarf Planets with the James Webb Space Telescope". The Astrophysical Journal. 923 (2): 144. arXiv:2109.12132. Bibcode:2021ApJ...923..144P. doi:10.3847/1538-4357/ac29be.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[1] "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.

[GaiaDR3-2] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[Crossfield-3] Crossfield, Ian J. M.; Waalkes, William; Newton, Elisabeth R.; Narita, Norio; Muirhead, Philip; Ment, Kristo; et al. (2019). "A Super-Earth and Sub-Neptune Transiting the Late-type M Dwarf LP 791-18". The Astrophysical Journal Letters. 883 (1): L16. arXiv:1906.09267. Bibcode:2019ApJ...883L..16C. doi:10.3847/2041-8213/ab3d30.

[SIMBAD-4] "LP 791-18". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 May 2023.

[Peterson-5] Peterson, Merrin S; Benneke, Björn; Collins, Karen; Piaulet, Caroline; Crossfield, Ian JM; Ali-Dib, Mohamad; et al. (2023). "A temperate Earth-sized planet with tidal heating transiting an M6 star". Nature. 617 (7962): 701–705. doi:10.1038/s41586-023-05934-8. hdl:11603/28165. PMID 37198481.

[NASA-20230516-6] Kazmierczak, Jeanette (16 May 2023). "NASA's Spitzer, TESS Find Potentially Volcano-Covered Earth-Size World". NASA. Retrieved 19 May 2023.

[Phillips2021-7] Phillips, Caprice L.; Wang, Ji; Kendrew, Sarah; Greene, Thomas P.; Hu, Renyu; Valenti, Jeff; Panero, Wendy R.; Schulze, Joseph (2021). "Detecting Biosignatures in the Atmospheres of Gas Dwarf Planets with the James Webb Space Telescope". The Astrophysical Journal. 923 (2): 144. arXiv:2109.12132. Bibcode:2021ApJ...923..144P. doi:10.3847/1538-4357/ac29be.