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

Chelsea X. Huang (MIT), Jennifer Burt, Andrew Vanderburg, Maximilian N. Günther, Avi Shporer, Jason A. Dittmann, Joshua N. Winn, Rob Wittenmyer, Lizhou Sha, Stephen R. Kane, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Jon Jenkins, Douglas A. Caldwell, Karen A. Collins, Natalia Guerrero, Jeffrey C. Smith, Sam Quinn, Stéphane Udry, Francesco Pepe, François Bouchy, Damien Sé gransan, Christophe Lovis, David Ehrenreich, Maxime Marmier, Michel Mayor, Bill Wohler, Kari Haworth, Edward Morgan, Michael Fausnaugh, David Charbonneau, Norio Narita, the TESS team

(Submitted on 16 Sep 2018)

We report the detection of a transiting planet around π 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 2.14± 0.04~R⊕ 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± 0.85~M⊕. The star’s proximity and brightness will facilitate further investigations, such as atmospheric spectroscopy, asteroseismology, the Rossiter-McLaughlin effect, astrometry, and direct imaging.

Comments:    Submitted to AAS Letter. This letter makes use of the TESS Alert data, which is currently in a beta test phase
Subjects:    Earth and Planetary Astrophysics (astro-ph.EP)
Cite as:    arXiv:1809.05967 [astro-ph.EP] (or arXiv:1809.05967v1 [astro-ph.EP] for this version)
Submission history
From: Xu Chelsea Huang [view email]
[v1] Sun, 16 Sep 2018 22:07:45 GMT (1254kb,D)
https://arxiv.org/abs/1809.05967