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20 April 2024

» arxiv » 2001.9175

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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 ; 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. Briceño ; R. P. Butler ; D. Charbonneau ; D. M. Conti ; J. Crane ; I. J .M. Crossfield ; M. Davies ; X. Delfosse ; R. F. Díaz ; 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. Jordán ; 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. Ségransan ; S. Shectman ; A. Shporer ; J. C. Smith ; P. Torres ; S. Udry ; J. Villasenor ; J .G. Winters ; G. Zhou ;
Date:	24 Jan 2020
Abstract:	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.
Source:	arXiv, 2001.9175
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