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arxiv: 2001.09175 · v1 · pith:R3UFZ6LXnew · submitted 2020-01-24 · 🌌 astro-ph.EP · astro-ph.SR

A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS

N. Astudillo-Defru , R. Cloutier , S. X. Wang , J. Teske , R. Brahm , C. Hellier , G. Ricker , R. Vanderspek
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D. Latham S. Seager J. N. Winn J. M. Jenkins K. A. Collins K. G. Stassun C. Ziegler J. M. Almenara D. R. Anderson E. Artigau X. Bonfils F. Bouchy C. Brice\~no R. P. Butler D. Charbonneau D. M. Conti J. Crane I. J .M. Crossfield M. Davies X. Delfosse R. F. D\'iaz R. Doyon D. Dragomir J. D. Eastman N. Espinoza Z. Essack F. Feng P. Figueira T. Forveille T. Gan A. Glidden N. Guerrero R. Hart Th. Henning E. P. Horch G. Isopi J. S. Jenkins A. Jord\'an J. F. Kielkopf N. Law C. Lovis F. Mallia A. W. Mann J. R. de Medeiros C. Melo R. E. Mennickent L. Mignon F. Murgas D. A. Nusdeo F. Pepe H. M. Relles M. Rose N. C. Santos D. S\'egransan S. Shectman A. Shporer J. C. Smith P. Torres S. Udry J. Villasenor J .G. Winters G. Zhou
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keywords planettessbrightdwarfmassmissionobservationsplanets
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We report the detection of a transiting super-Earth-sized planet (R=1.39+-0.09 Rearth) in a 1.4-day orbit around L 168-9 (TOI-134),a bright M1V dwarf (V=11, K=7.1) located at 25.15+-0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission and, for confirmation and planet mass measurement, was followed up with ground-based photometry, seeing-limited and high-resolution imaging, and precise radial velocity (PRV) observations using the HARPS and PFS spectrographs. Combining the TESS data and PRV observations, we find the mass of L168-9 b to be 4.60+-0.56 Mearth, and thus the bulk density to be 1.74+0.44-0.33 times larger than that of the Earth. The orbital eccentricity is smaller than 0.21 (95% confidence). This planet is a Level One Candidate for the TESS Mission's scientific objective - to measure the masses of 50 small planets - and is one of the most observationally accessible terrestrial planets for future atmospheric characterization.

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