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TESS Discovery of a Transiting Super-Earth in the π Mensae System

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arxiv 1809.05967 v2 pith:CKCZTEEH submitted 2018-09-16 astro-ph.EP

TESS Discovery of a Transiting Super-Earth in the π Mensae System

Chelsea X. Huang (MIT) , Jennifer Burt , Andrew Vanderburg , Maximilian N. G\"unther , Avi Shporer , Jason A. Dittmann , Joshua N. Winn , Rob Wittenmyer
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Lizhou Sha Stephen R. Kane George R. Ricker Roland K. Vanderspek David W. Latham Sara Seager Jon M. Jenkins Douglas A. Caldwell Karen A. Collins Natalia Guerrero Jeffrey C. Smith Samuel N. Quinn St\'ephane Udry Francesco Pepe Fran\c{c}ois Bouchy Damien S\'egransan Christophe Lovis David Ehrenreich Maxime Marmier Michel Mayor Bill Wohler Kari Haworth Edward H. Morgan Michael Fausnaugh David R. Ciardi Jessie Christiansen David Charbonneau Diana Dragomir Drake Deming Ana Glidden Alan M. Levine P.R. McCullough Liang Yu Norio Narita Tam Nguyen Tim Morton Joshua Pepper Andr\'as P\'al Joseph E. Rodriguez the TESS team
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We report the detection of a transiting planet around $\pi$ Mensae (HD 39091), using data from the Transiting Exoplanet Survey Satellite (TESS). The solar-type host star is unusually bright (V=5.7) and was already known to host a Jovian planet on a highly eccentric, 5.7-year orbit. The newly discovered planet has a size of $2.04\pm 0.05$ $R_\oplus$ and an orbital period of 6.27 days. Radial-velocity data from the HARPS and AAT/UCLES archives also displays a 6.27-day periodicity, confirming the existence of the planet and leading to a mass determination of $4.82\pm 0.85$ $M_\oplus$. The star's proximity and brightness will facilitate further investigations, such as atmospheric spectroscopy, asteroseismology, the Rossiter--McLaughlin effect, astrometry, and direct imaging.

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