TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844

Roland Vanderspek (MIT) , Chelsea X. Huang , Andrew Vanderburg , George R. Ricker , David W. Latham , Sara Seager , Joshua N. Winn , Jon M. Jenkins

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Jennifer Burt Jason Dittmann Elisabeth Newton Samuel N. Quinn Avi Shporer David Charbonneau Jonathan Irwin Kristo Ment Jennifer G. Winters Karen A. Collins Phil Evans Tianjun Gan Rhodes Hart Eric L.N. Jensen John Kielkopf Shude Mao William Waalkes Fran\c{c}ois Bouchy Maxime Marmier Louise D. Nielsen Ga\"el Ottoni Francesco Pepe Damien S\'egransan St\'ephane Udry Todd Henry Leonardo A. Paredes Hodari-Sadiki James Rodrigo H. Hinojosa Michele L. Silverstein Enric Palle Zachory Berta-Thompson Misty D. Davies Michael Fausnaugh Ana W. Glidden Joshua Pepper Edward H. Morgan Mark Rose Joseph D. Twicken Jesus Noel S. Villase\~nor the TESS team

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classification 🌌 astro-ph.EP

keywords planetaroundstardwarfspectroscopytessalthoughatmosphere

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Data from the newly-commissioned \textit{Transiting Exoplanet Survey Satellite} (TESS) has revealed a "hot Earth" around LHS 3844, an M dwarf located 15 pc away. The planet has a radius of $1.32\pm 0.02$ $R_\oplus$ and orbits the star every 11 hours. Although the existence of an atmosphere around such a strongly irradiated planet is questionable, the star is bright enough ($I=11.9$, $K=9.1$) for this possibility to be investigated with transit and occultation spectroscopy. The star's brightness and the planet's short period will also facilitate the measurement of the planet's mass through Doppler spectroscopy.

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TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844

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