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

Chelsea X. Huang, 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 K. Vanderspek, David W. Latham, Sara Seager, Jon M. Jenkins, Douglas A. Caldwell, Karen A. Collins, Natalia Guerrero, Jeffrey C. Smith, Samuel N. QuinnStéphane Udry, Francesco Pepe, Francois Bouchy, Damien Ségransan, 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, András Pál, Joseph E. Rodriguez, Keivan G. Stassun, Guillermo Torres, Alessandro Sozzetti, John P. Doty, Jorgen Christensen-Dalsgaard, Gregory Laughlin, Mark Clampin, Jacob L. Bean, Lars A. Buchhave, G. A. Bakos, Bun'Ei Sato, Shigeru Ida, Lisa Kaltenegger, Enric Palle, Dimitar Sasselov, R. P. Butler, Jack Lissauer, Jian Ge, S. A. Rinehart

Research output: Contribution to journalArticlepeer-review

148 Scopus citations


We report the detection of a transiting planet around π Men (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 yr orbit. The newly discovered planet has a size of 2.04 ± 0.05 R and an orbital period of 6.27 days. Radial-velocity data from the High-Accuracy Radial-velocity Planet Searcher and Anglo-Australian Telescope/University College London Echelle Spectrograph 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.

Original languageEnglish (US)
Article numberL39
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Dec 1 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planetary systems
  • planets and satellites: detection
  • stars: individual (HD 39091 TIC 261136679)


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