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K2-265 b: a transiting rocky super-Earth

Lam, K. W. F. and Ciardi, D. (2018) K2-265 b: a transiting rocky super-Earth. Astronomy and Astrophysics, 620 . Art. No. A77. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20190107-110743785

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Abstract

We report the discovery of the super-Earth K2-265 b detected with K2 photometry. The planet orbits a bright (V_(mag) = 11.1) star of spectral type G8V with a period of 2.37 days. We obtained high-precision follow-up radial velocity measurements from HARPS, and the joint Bayesian analysis showed that K2-265 b has a radius of 1.71 ± 0.11 R⊕ and a mass of 6.54 ± 0.84 M⊕, corresponding to a bulk density of 7.1 ± 1.8 g cm^(−3). Composition analysis of the planet reveals an Earth-like, rocky interior; this object has a rock mass fraction of ~80%. The short orbital period and small radius of the planet puts it below the lower limit of the photoevaporation gap, where the envelope of the planet could have eroded owing to strong stellar irradiation, leaving behind an exposed core. Knowledge of the planet core composition allows us to infer the possible formation and evolution mechanism responsible for its current physical parameters.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361/201834073DOIArticle
https://arxiv.org/abs/1809.08869arXivDiscussion Paper
ORCID:
AuthorORCID
Ciardi, D.0000-0002-5741-3047
Additional Information:© 2018 ESO. Article published by EDP Sciences. Received 12 August 2018; Accepted 21 September 2018; Published online 29 November 2018. We thank the anonymous referee for the helpful comments that improved the manuscript. D.J.A.B. acknowledges support by the UK Space Agency. D.J.A. gratefully acknowledges support from the STFC via an Ernest Rutherford Fellowship (ST/R00384X/1). This work was funded by FEDER – Fundo Europeu de Desenvolvimento Regional funds through the COMPETE 2020 – Programa Operacional Competitividade e Internacionalização (POCI), and by Portuguese funds through FCT – Fundação para a Ciência e a Tecnologia in the framework of the projects POCI-01-0145-FEDER-028953 and POCI-01-0145-FEDER-032113. N.S. and O.D. also acknowledge the support from FCT and FEDER through COMPETE2020 to grants UID/FIS/04434/2013 and POCI-01-0145-FEDER-007672, PTDC/FIS-AST/1526/2014 and POCI-01-0145-FEDER-016886, and PTDC/FIS-AST/7073/2014 and POCI-01-0145-FEDER-016880. S.G.S acknowledges support from FCT through Investigador FCT contract nr. IF/00028/2014/CP1215/CT0002. S.C.C.B. also acknowledges support from FCT through Investigador FCT contracts IF/01312/2014/CP1215/CT0004. E.D.M. acknowledges the support by the Investigador FCT contract IF/00849/2015/CP1273/CT0003. R.L. has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement n.664931. F.F. acknowledges support from PLATO ASI-INAF contract n.2015-019-R0. This research was made possible through the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of NASA’s Astrophysics Data System Bibliographic Services. This paper includes data collected by the K2 mission. Funding for the K2 mission is provided by the NASA Science Mission directorate. This research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
United Kingdom Space Agency (UKSA)UNSPECIFIED
Science and Technology Facilities Council (STFC)ST/R00384X/1
Fundo Europeu de Desenvolvimento RegionalUNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)POCI-01-0145-FEDER-028953
Fundação para a Ciência e a Tecnologia (FCT)POCI-01-0145-FEDER-032113
Fundação para a Ciência e a Tecnologia (FCT)UID/FIS/04434/2013
Fundação para a Ciência e a Tecnologia (FCT)POCI-01-0145-FEDER-007672
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS-AST/1526/2014
Fundação para a Ciência e a Tecnologia (FCT)POCI-01-0145-FEDER-016886
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS-AST/7073/2014
Fundação para a Ciência e a Tecnologia (FCT)POCI-01-0145-FEDER-016880
Fundação para a Ciência e a Tecnologia (FCT)IF/00028/2014/CP1215/CT0002
Fundação para a Ciência e a Tecnologia (FCT)IF/01312/2014/CP1215/CT0004
Fundação para a Ciência e a Tecnologia (FCT)IF/00849/2015/CP1273/CT0003
Marie Curie Fellowship664931
Agenzia Spaziale Italiana (ASI)2015-019-R0
Robert Martin Ayers Sciences FundUNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
NSFUNSPECIFIED
Gaia Multilateral AgreementUNSPECIFIED
Subject Keywords:techniques: photometric – techniques: radial velocities – planets and satellites: detection – stars: individual: K2-265 – planets and satellites: composition
Record Number:CaltechAUTHORS:20190107-110743785
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190107-110743785
Official Citation:K2-265 b: a transiting rocky super-Earth. K. W. F. Lam, A. Santerne, S. G. Sousa, A. Vigan, D. J. Armstrong, S. C. C. Barros, B. Brugger, V. Adibekyan, J.-M. Almenara, E. Delgado Mena, X. Dumusque, D. Barrado, D. Bayliss, A. S. Bonomo, F. Bouchy, D. J. A. Brown, D. Ciardi, M. Deleuil, O. Demangeon, F. Faedi, E. Foxell, J. A. G. Jackman, G. W. King, J. Kirk, R. Ligi, J. Lillo-Box, T. Lopez, C. Lovis, T. Louden, L. D. Nielsen, J. McCormac, O. Mousis, H. P. Osborn, D. Pollacco, N. C. Santos, S. Udry and P. J. Wheatley. A&A, 620 (2018) A77. DOI: https://doi.org/10.1051/0004-6361/201834073
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92115
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Jan 2019 19:24
Last Modified:03 Oct 2019 20:41

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