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TESS's first planet: A super-Earth transiting the naked-eye star π Mensae

Gandolfi, D. (author)
Universita degli Studi di Torino,University of Turin
Barragán, O. (author)
Universita degli Studi di Torino,University of Turin
Livingston, J.H. (author)
University of Tokyo, Japan
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Fridlund, Malcolm, 1952 (author)
Universiteit Leiden (UL),Leiden University (UL),Chalmers tekniska högskola,Chalmers University of Technology
Justesen, A.B. (author)
Århus Universitet,Aarhus University
Redfield, S. (author)
Wesleyan University
Fossati, L. (author)
Mathur, S. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Grziwa, S. (author)
Universität zu Köln,University of Cologne
Cabrera, J. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
García, R. A. (author)
Paris Diderot University, France,Université Paris-Saclay,University Paris-Saclay
Persson, Carina, 1964 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Van Eylen, Vincent (author)
Princeton University
Hatzes, A. (author)
Thüringer Landessternwarte Tautenburg
Hidalgo, D. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Albrecht, Simon (author)
Århus Universitet,Aarhus University
Bugnet, L. (author)
Paris Diderot University, France,Université Paris-Saclay,University Paris-Saclay
Cochran, William D. (author)
The University of Texas at Austin, USA
Csizmadia, Szilard (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Deeg, H. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Eigmüller, P. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Endl, M. (author)
The University of Texas at Austin, USA
Erikson, Anders (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Esposito, M. (author)
Thüringer Landessternwarte Tautenburg
Guenther, E. W. (author)
Thüringer Landessternwarte Tautenburg
Korth, Judith (author)
Universität zu Köln,University of Cologne
Luque, R. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Rodriguez, P. M. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Nespral, David (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Nowak, G. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Pätzold, Martin (author)
Universität zu Köln,University of Cologne
Prieto-Arranz, J. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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 (creator_code:org_t)
2018-11-22
2018
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 619
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We report on the confirmation and mass determination of π Men c, the first transiting planet discovered by NASA's TESS space mission. π Men is a naked-eye (V = 5.65 mag), quiet G0 V star that was previously known to host a sub-stellar companion (π Men b) on a longperiod (Porb = 2091 days), eccentric (e = 0.64) orbit. Using TESS time-series photometry, combined with Gaia data, published UCLES at AAT Doppler measurements, and archival HARPS at ESO-3.6m radial velocities, we found that π Men c is a close-in planet with an orbital period of Porb = 6.27 days, a mass of Mc = 4.52 ± 0.81 Mo, and a radius of Rc = 2.06 ± 0.03 Ro. Based on the planet's orbital period and size, π Men c is a super-Earth located at, or close to, the radius gap, while its mass and bulk density suggest it may have held on to a significant atmosphere. Because of the brightness of the host star, this system is highly suitable for a wide range of further studies to characterize the planetary atmosphere and dynamical properties. We also performed an asteroseismic analysis of the TESS data and detected a hint of power excess consistent with the seismic values expected for this star, although this result depends on the photometric aperture used to extract the light curve. This marginal detection is expected from pre-launch simulations hinting at the asteroseismic potential of the TESS mission for longer, multi-sector observations and/or for more evolved bright stars.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

Planets and satellites: terrestrial planets
Stars: fundamental parameters
Planetary systems
Planets and satellites: fundamental parameters
Planets and satellites: detection

Publication and Content Type

art (subject category)
ref (subject category)

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