Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] We present high-precision radial velocities (RVs) from the HARPS-N spectrograph for HD 79210 and HD 79211, two M0V members of a gravitationally bound binary system. We detect a planet candidate with a period of 24.421 − 0.017 + 0.016 days around HD 79211 in these HARPS-N RVs, validating the planet candidate originally identified in CARMENES RV data alone. Using HARPS-N, CARMENES, and RVs spanning a total of 25 yr, we further refine the planet candidate parameters to P = 24.422 ± 0.014 days, K = 3.19 ± 0.27 m s−1, M sin i = 10.6 ± 1.2M ⊕, and a = 0.142 ± 0.005 au. We do not find any additional planet candidate signals in the data of HD 79211, nor do we find any planet candidate signals in HD 79210. This system adds to the number of exoplanets detected in binaries with M-dwarf members and serves as a case study for planet formation in stellar binaries.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
DiTomasso, Victoria ; Center for Astrophysics, Harvard & Smithsonian, Cambridge, United States
Nava, Chantanelle ; Center for Astrophysics, Harvard & Smithsonian, Cambridge, United States
López-Morales, Mercedes ; Center for Astrophysics, Harvard & Smithsonian, Cambridge, United States
Bieryla, Allyson ; Center for Astrophysics, Harvard & Smithsonian, Cambridge, United States
Cloutier, Ryan ; Center for Astrophysics, Harvard & Smithsonian, Cambridge, United States
Malavolta, Luca ; Dipartimento di Fisica e Astronomia “Galileo Galilei, ” Universitá di Padova, Padova, Italy
Mortier, Annelies ; KICC & Astrophysics Group, Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom ; School of Physics & Astronomy, University of Birmingham, Birmingham, United Kingdom
Buchhave, Lars A. ; DTU Space, National Space Institute, Technical University of Denmark, Kgs. Lyngby, Denmark
Stassun, Keivan G. ; Department of Physics and Astronomy, Vanderbilt University, Nashville, United States
Rice, Ken ; SUPA, Institute for Astronomy, University of Edinburgh, Edinburgh, United Kingdom ; Centre for Exoplanet Science, University of Edinburgh, Edinburgh, United Kingdom
Sasselov, Dimitar ; Center for Astrophysics, Harvard & Smithsonian, Cambridge, United States
Stalport, Manu ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Observatoire de Geneva, Universite de Geneve, Sauverny, Switzerland
Udry, Stéphane ; Department of Astronomy, University of Geneva, Versoix, Switzerland
Watson, Christopher ; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
Wilson, Thomas G. ; Centre for Exoplanet Science, SUPA School of Physics and Astronomy, University of St Andrews, St Andrews, United Kingdom
NSF - National Science Foundation NASA - National Aeronautics and Space Administration STFC - Science and Technology Facilities Council UKSA - UK Space Agency
Funding text :
This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under grant No. DGE1745303. The HARPS-N project was funded by the Prodex Program of the Swiss Space Office (SSO), the Harvard- University Origin of Life Initiative (HUOLI), the Scottish Universities Physics Alliance (SUPA), the University of Geneva, the Smithsonian Astrophysical Observatory (SAO), the Italian National Astrophysical Institute (INAF), University of St. Andrews, Queen's University Belfast, and University of Edinburgh. Parts of this work have been supported by the National Aeronautics and Space Administration under grant No. NNX17AB59G, issued through the Exoplanets Research Program. Parts of this work have been supported by the Brinson Foundation. R.D.H. is funded by the UK Science and Technology Facilities Council (STFC)'s Ernest Rutherford Fellowship (grant No. ST/V004735/1). T.G.W and A.C.C acknowledge support from STFC consolidated grant Nos. ST/R000824/1 and ST/V000861/1, and UKSA grant ST/R003203/1. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
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