TESS Discovery of a Transiting Super-Earth in the pi Mensae System
Deming, Drake; Pál, András; Torres, Guillermo; Vanderburg, Andrew; Ge, Jian; Latham, David W.; Quinn, Samuel N.; Kane, Stephen R.; Pepper, Joshua; Stassun, Keivan G.; Butler, R. P.; Sato, Bun'ei; Collins, Karen A.; Wohler, Bill; Ricker, George R.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Caldwell, Douglas A.; Buchhave, Lars A.; Clampin, Mark; Günther, Maximilian N.; Shporer, Avi; Ciardi, David R.; Narita, Norio; Palle, Enric; Dragomir, Diana; Udry, Stéphane; Rodriguez, Joseph E.; Huang, Chelsea X.; Levine, Alan M.; Dittmann, Jason A.; Burt, Jennifer; Vanderspek, Roland K.; Bean, Jacob L.; Fausnaugh, Michael; Guerrero, Natalia; Christensen-Dalsgaard, Jørgen; Bouchy, François; Charbonneau, David; Laughlin, Gregory; Pepe, Francesco; Morton, Tim; Yu, Liang; Smith, Jeffrey C.; Glidden, Ana; Doty, John P.; Lovis, Christophe; Sasselov, Dimitar; Sozzetti, Alessandro; Kaltenegger, Lisa; Ehrenreich, David; Mayor, Michel; Ida, Shigeru; Bakos, G. Á.; Morgan, Edward H.; Ségransan, Damien; Christiansen, Jessie; Rinehart, S. A.; Sha, Lizhou; McCullough, P. R.; Marmier, Maxime; Wittenmyer, Rob; Haworth, Kari; Nguyen, Tam; Lissauer, Jack
United States, Australia, Switzerland, Japan, Spain, Hungary, Italy, Denmark
Abstract
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.