History and Habitability of the LP 890-9 Planetary System

Document detail

ID

oai:arXiv.org:2412.02743

Topic

Astrophysics - Earth and Planetary...

Author

Barnes, Rory Amaral, Laura N. R. do Birky, Jessica Carone, Ludmila Driscoll, Peter Livesey, Joseph R. Graham, David Becker, Juliette Cui, Kaiming Schlecker, Martin Garcia, Rodolfo Gialluca, Megan Adams, Arthur Ahmed, MD Redyan Bonney, Paul Broussard, Wynter Chawla, Chetan Damasso, Mario Danchi, William C. Deitrick, Russell Ducrot, Elsa Fromont, Emeline F. Gaches, Brandt A. L. Gupta, Sakshi Hill, Michelle L. Jackman, James A. G. Janin, Estelle M. Karawacki, Mikolaj Koren, Matheus Daniel La Greca, Roberto Leung, Michaela Miranda-Rosete, Arturo Olohoy, Michael Kent A. Ngo, Cecelia Paul, Daria Sahu, Chandan Kumar Sarkar, Debajyoti Basu Shadab, Mohammad Afzal Schwieterman, Edward W. Sedler, Melissa Texeira, Katie Vazan, Allona Vega, Karen N. Delgado Vijayakumar, Rohit Wojack, Jonathan T.

Year

2024

listing date

12/11/2024

Keywords

planetary tidal

Metrics

Abstract

We present numerous aspects of the evolution of the LP 890-9 (SPECULOOS-2/TOI-4306) planetary system, focusing on the likelihood that planet c can support life.

We find that the host star reaches the main sequence in 1 Gyr and that planet c lies close to the inner boundary of the habitable zone.

We find the magma ocean stage can last up to 50 Myr, remove 8 Earth-oceans of water, and leave up to 2000 bars of oxygen in the atmosphere.

However, if the planet forms with a hydrogen envelope as small as 0.1 Earth-masses, no water will be lost during the star's pre-main sequence phase from thermal escape processes.

We find that the planets are unlikely to be in a 3:1 mean motion resonance and that both planets tidally circularize within 0.5 Gyr when tidal dissipation is held constant.

However, if tidal dissipation is a function of mantle temperature and rheology, then we find that planet c's orbit may require more than 7 Gyr to circularize, during which time tidal heating may reach hundreds of terawatts.

We thus conclude that the habitability of planet c depends most strongly on the initial volatile content and internal properties, but no data yet preclude the viability of an active biosphere on the planet.

;Comment: 16 pages, 9 figures, accepted to PSJ

Barnes, Rory,Amaral, Laura N. R. do,Birky, Jessica,Carone, Ludmila,Driscoll, Peter,Livesey, Joseph R.,Graham, David,Becker, Juliette,Cui, Kaiming,Schlecker, Martin,Garcia, Rodolfo,Gialluca, Megan,Adams, Arthur,Ahmed, MD Redyan,Bonney, Paul,Broussard, Wynter,Chawla, Chetan,Damasso, Mario,Danchi, William C.,Deitrick, Russell,Ducrot, Elsa,Fromont, Emeline F.,Gaches, Brandt A. L.,Gupta, Sakshi,Hill, Michelle L.,Jackman, James A. G.,Janin, Estelle M.,Karawacki, Mikolaj,Koren, Matheus Daniel,La Greca, Roberto,Leung, Michaela,Miranda-Rosete, Arturo,Olohoy, Michael Kent A.,Ngo, Cecelia,Paul, Daria,Sahu, Chandan Kumar,Sarkar, Debajyoti Basu,Shadab, Mohammad Afzal,Schwieterman, Edward W.,Sedler, Melissa,Texeira, Katie,Vazan, Allona,Vega, Karen N. Delgado,Vijayakumar, Rohit,Wojack, Jonathan T., 2024, History and Habitability of the LP 890-9 Planetary System