Bibcode
Kostov, Veselin B.; Schlieder, Joshua E.; Barclay, Thomas; Quintana, Elisa V.; Colón, Knicole D.; Brande, Jonathan; Collins, Karen A.; Feinstein, Adina D.; Hadden, Samuel; Kane, Stephen R.; Kreidberg, Laura; Kruse, Ethan; Lam, Christopher; Matthews, Elisabeth; Montet, Benjamin T.; Pozuelos, Francisco J.; Stassun, Keivan G.; Winters, Jennifer G.; Ricker, George; Vanderspek, Roland; Latham, David; Seager, Sara; Winn, Joshua; Jenkins, Jon M.; Afanasev, Dennis; Armstrong, James J. D.; Arney, Giada; Boyd, Patricia; Barentsen, Geert; Barkaoui, Khalid; Batalha, Natalie E.; Beichman, Charles; Bayliss, Daniel; Burke, Christopher; Burdanov, Artem; Cacciapuoti, Luca; Carson, Andrew; Charbonneau, David; Christiansen, Jessie; Ciardi, David; Clampin, Mark; Collins, Kevin I.; Conti, Dennis M.; Coughlin, Jeffrey; Covone, Giovanni; Crossfield, Ian; Delrez, Laetitia; Domagal-Goldman, Shawn; Dressing, Courtney; Ducrot, Elsa; Essack, Zahra; Everett, Mark E.; Fauchez, Thomas; Foreman-Mackey, Daniel; Gan, Tianjun; Gilbert, Emily; Gillon, Michaël; Gonzales, Erica; Hamann, Aaron; Hedges, Christina; Hocutt, Hannah; Hoffman, Kelsey; Horch, Elliott P.; Horne, Keith; Howell, Steve; Hynes, Shane; Ireland, Michael; Irwin, Jonathan M.; Isopi, Giovanni; Jensen, Eric L. N.; Jehin, Emmanuël; Kaltenegger, Lisa; Kielkopf, John F.; Kopparapu, Ravi; Lewis, Nikole; Lopez, Eric; Lissauer, Jack J.; Mann, Andrew W.; Mallia, Franco; Mandell, Avi; Matson, Rachel A.; Mazeh, Tsevi; Monsue, Teresa; Moran, Sarah E.; Moran, Vickie; Morley, Caroline V.; Morris, Brett; Muirhead, Philip; Mukai, Koji; Mullally, Susan; Mullally, Fergal; Murray, Catriona; Narita, Norio; Palle, Enric; Pidhorodetska, Daria; Quinn, David; Relles, Howard; Rinehart, Stephen; Ritsko, Matthew; Rodriguez, Joseph E. et al.
Bibliographical reference
The Astronomical Journal, Volume 158, Issue 1, article id. 32, 25 pp. (2019).
Advertised on:
7
2019
Citations
104
Refereed citations
100
Description
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of
three terrestrial-size planets transiting L 98-59 (TOI-175, TIC
307210830)—a bright M dwarf at a distance of 10.6 pc. Using the
Gaia-measured distance and broadband photometry, we find that the host
star is an M3 dwarf. Combined with the TESS transits from three sectors,
the corresponding stellar parameters yield planet radii ranging from 0.8
R ⊕ to 1.6 R ⊕. All three planets have
short orbital periods, ranging from 2.25 to 7.45 days with the outer
pair just wide of a 2:1 period resonance. Diagnostic tests produced by
the TESS Data Validation Report and the vetting package DAVE rule out
common false-positive sources. These analyses, along with dedicated
follow-up and the multiplicity of the system, lend confidence that the
observed signals are caused by planets transiting L 98-59 and are not
associated with other sources in the field. The L 98-59 system is
interesting for a number of reasons: the host star is bright (V = 11.7
mag, K = 7.1 mag) and the planets are prime targets for further
follow-up observations including precision radial-velocity mass
measurements and future transit spectroscopy with the James Webb Space
Telescope; the near-resonant configuration makes the system a laboratory
to study planetary system dynamical evolution; and three planets of
relatively similar size in the same system present an opportunity to
study terrestrial planets where other variables (age, metallicity, etc.)
can be held constant. L 98-59 will be observed in four more TESS
sectors, which will provide a wealth of information on the three
currently known planets and have the potential to reveal additional
planets in the system.
Related projects
Exoplanets and Astrobiology
The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
Enric
Pallé Bago