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Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260

Georgieva, I. Y. and Persson, C. M. and Barragán, O. and Nowak, G. and Fridlund, M. and Locci, D. and Palle, E. and Luque, R. and Carleo, I. and Gandolfi, D. and Kane, Stephen R. and Korth, J. and Stassun, Keivan G. and Livingston, J. and Matthews, E.C. and Collins, K. A. and Howell, Steve B. and Serrano, L.M. and Albrecht, S. and Bieryla, A. and Brasseur, C. E. and Ciardi, David R. and Cochran, W. D. and Colón, K.D. and Crossfield, Ian J. M. and Csizmadia, Szilard and Deeg, H. and Esposito, M. and Furlan, E. and Gan, T. and Goffo, E. and Gonzales, Erica J. and Grziwa, S. and Guenther, E. and Guerra, P. and Hirano, T. and Jenkins, J. M. and Jensen, E.L.N. and Kabath, P. and Knudstrup, E. and Lam, K. W. F. and Latham, D.W. and Levine, A. M. and Matson, R. A. and McDermid, Stuart and Osborne, H.L.M. and Paegert, M. and Quinn, S. N. and Redfield, Seth and Ricker, G. and Schlieder, J.E. and Scott, N.J. and Seager, S. and Smith, Alexis M S and Tenenbaum, P. and Twicken, Joseph D. and Vanderspek, Roland and Van Eylen, V. and Winn, J. N. (2021) Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260. Monthly Notices of the Royal Astronomical Society, 505 (4), pp. 4684-4701. Oxford University Press. doi: 10.1093/mnras/stab1464. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/505/4/4684/6280967

Abstract

We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6 V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of Rb = 2.33 ± 0.10 and Rc = 2.82 ± 0.15 R⊕, and periods of 3.13 and 7.49 d for TOI-1260 b and TOI-1260 c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain Mb = 8.6+1.4−1.5 and Mc = 11.8+3.4−3.2 M⊕. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light-curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian process approach. We test the system's stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2-3 R⊕ range.

Item URL in elib:https://elib.dlr.de/146466/
Document Type:Article
Title:Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Georgieva, I. Y.Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, SwedenUNSPECIFIED
Persson, C. M.Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, SwedenUNSPECIFIED
Barragán, O.Sub-department of Astrophysics, Department of Physics, Universityof Oxford, Oxford OX1 3RH, UKUNSPECIFIED
Nowak, G.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Fridlund, M.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, Sweden; Leiden Observatory, Leiden University, 2333CA, Leiden, The NetherlandsUNSPECIFIED
Locci, D.INAF – Osservatorio Astronomico di Palermo, Piazza del Parlamento 1,I-90134 Palermo, ItalyUNSPECIFIED
Palle, E.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Luque, R.Departamento de Astrofísica, Universidad de La Laguna, E-38206,UNSPECIFIED
Carleo, I.INAF - Osservatorio Astronomico di Padova, Vcolo dell'Osservatorio 5, 35122-Padova, ItalyUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita di Torino, via P. Giuria 1, I-10125 Torino, ItalyUNSPECIFIED
Kane, Stephen R.Department of Earth and Planetary Sciences, University of California, Riverside, CA 92521, USAUNSPECIFIED
Korth, J.Department of Space, Earth and Environment, Astronomy and PlasmaPhysics, Chalmers University of Technology, SE-412 96 Gothenburg, SwedenUNSPECIFIED
Stassun, Keivan G.Vanderbilt University, Department of Physics & Astronomy, 6301 Stevenson Center Lane, Nashville, TN 37235, US ; Fisk University, Department of Physics, 1000 17th Avenue North, Nashville, TN 37208, US 0000-0002-3481-9052UNSPECIFIED
Livingston, J.Department of Astronomy, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Matthews, E.C.Department of Physics and Kavli Institute for Astrophysics andSpace Research, Massachusetts Institute of Technology, Cambridge,MA 02139, USAUNSPECIFIED
Collins, K. A.Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USAUNSPECIFIED
Howell, Steve B.NASA Ames Research Center, Moffett Field, CA 94035, USAUNSPECIFIED
Serrano, L.M.Dipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, ItalyUNSPECIFIED
Albrecht, S.Stellar Astrophysics Centre, Department of Physics and Astronomy, AarhusUniversity, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Bieryla, A.Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USAUNSPECIFIED
Brasseur, C. E.Space Telescope Science Institute, 3700 San Martin Dr, Baltimore, MD21218, USAUNSPECIFIED
Ciardi, David R.NASA Exoplanet Science Institute, Caltech, Pasadena, CA, USAUNSPECIFIED
Cochran, W. D.Department of Astronomy and McDonald Observatory, Universityof Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712,USAUNSPECIFIED
Colón, K.D.Exoplanets and Stellar Astrophysics Laboratory, Mail Code 667,NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Green-belt MD, 20771, USAUNSPECIFIED
Crossfield, Ian J. M.Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USAUNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIED
Deeg, H.Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, SpainUNSPECIFIED
Esposito, M.Thüringer Landessternwarte Tautenburg, 07778, Tautenburg, GermanyUNSPECIFIED
Furlan, E.NASA Exoplanet Science Institute, Caltech/IPAC, Mail Code 100-22, 1200 E. California Blvd., Pasadena, CA 91125, USAUNSPECIFIED
Gan, T.Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing, 100084, PR ChinaUNSPECIFIED
Goffo, E.Dipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, ItalyUNSPECIFIED
Gonzales, Erica J.Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA, USAUNSPECIFIED
Grziwa, S.Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, GermanyUNSPECIFIED
Guenther, E.Thueringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Guerra, P.Observatori Astronómic Albanyá, Camí de Bassegoda s/n, Albanyá 17733, Girona, SpainUNSPECIFIED
Hirano, T.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, JapanUNSPECIFIED
Jenkins, J. M.NASA Ames Research Center, Moffett Field, CA, 94035, USAUNSPECIFIED
Jensen, E.L.N.Department of Physics & Astronomy, Swarthmore College,Swarthmore PA 19081, USAUNSPECIFIED
Kabath, P.Astronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech RepublicUNSPECIFIED
Knudstrup, E.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, DenmarkUNSPECIFIED
Lam, K. W. F.DLR, Institute of Planetary Research, Dept. of Extrasolar Planets and Atmospheres, Berlin, D-12489, Rutherfordstrasse 2.UNSPECIFIED
Latham, D.W.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA, 02138, USAUNSPECIFIED
Levine, A. M.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USAUNSPECIFIED
Matson, R. A.U.S. Naval Observatory, Washington, DC 20392, USAUNSPECIFIED
McDermid, StuartNASA-JPLUNSPECIFIED
Osborne, H.L.M.Mullard Space Science Laboratory, University College London, HolmburySt Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIED
Paegert, M.Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USAUNSPECIFIED
Quinn, S. N.Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USAUNSPECIFIED
Redfield, SethAstronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459, USA 0000-0003-3786-3486UNSPECIFIED
Ricker, G.Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA, 02139, USAUNSPECIFIED
Schlieder, J.E.Exoplanets and Stellar Astrophysics Laboratory, Mail Code 667,NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Green-belt MD, 20771, USAUNSPECIFIED
Scott, N.J.Space Science & Astrobiology Division, NASA Ames ResearchCenter, Moffett Field, CA 94035, USAUNSPECIFIED
Seager, S.Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA, 02139, USA; Department of Aeronautics and Astronautics, MIT, Cambridge, MA, 0213UNSPECIFIED
Smith, Alexis M SUNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341
Tenenbaum, P.SETI Institute/NASA Ames Research Center, Moffet Field, CA 94035, USAUNSPECIFIED
Twicken, Joseph D.NASA Ames Research Center, Moffett Field, CA 94035, USA; SETI Institute, 189 Bernardo Ave., Suite 200, Mountain View, CA 94043, USAUNSPECIFIED
Vanderspek, RolandDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIED
Van Eylen, V.Mullard Space Science Laboratory, University College London, HolmburySt Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIED
Winn, J. N.Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ, 08544, USA)UNSPECIFIED
Date:October 2021
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:505
DOI:10.1093/mnras/stab1464
Page Range:pp. 4684-4701
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:techniques: photometric; techniques: radial velocities; planets and satellites: atmospheres; planets and satellites: individual: TOI-1260b; c; planets and satellites: composition; stars: low-mass; planetary systems; Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Csizmadia, Szilard
Deposited On:30 Nov 2021 10:24
Last Modified:30 Nov 2021 10:24

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