TESS Discovery of a Transiting Super-Earth in the pi Mensae System
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2018
- DOI:
- 10.3847/2041-8213/aaef91
- arXiv:
- arXiv:1809.05967
- Bibcode:
- 2018ApJ...868L..39H
- Keywords:
-
- planetary systems;
- planets and satellites: detection;
- stars: individual: HD 39091;
- TIC 261136679;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- Accepted for publication ApJ Letters. This letter makes use of the TESS Alert data, which is currently in a beta test phase. The discovery light curve is included in a table inside the arxiv submission