Abstract
We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AO imaging and Gaia data we identify two M-dwarf companions at a separation of 113 ± 2 and 2467+−177155 au. From radial velocities, K2 photometry, and stellar characterization of the host star, we find the inner planet to be a mini-Neptune with a radius of 3.06 ± 0.16 R and an orbital period of P = 9.2 d. The radius of the mini-Neptune suggests that the planet is located above the radius valley, and with an incident flux of F ∼ 400 F, it lies safely outside the super-Earth desert. The outer warm Jupiter has a mass of 0.774 ± 0.047 MJ and a radius of 1.006 ± 0.050 RJ, and orbits the host star every 48.4 d on an orbit with an eccentricity e < 0.241. Its mild eccentricity and mini-Neptune sibling suggest that the warm Jupiter originates from in situ formation or disc migration.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3522-3536 |
| Number of pages | 15 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 484 |
| Issue number | 3 |
| DOIs | |
| State | Published - Apr 11 2019 |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
Keywords
- Planets
- Planets and satellites: detection
- Planets and satellites: formation
- Planets and satellites: individual: K2-290
- Satellites: individual: EPIC 249624646
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In: Monthly Notices of the Royal Astronomical Society, Vol. 484, No. 3, 11.04.2019, p. 3522-3536.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - K2-290
T2 - A warm Jupiter and a mini-Neptune in a triple-star system
AU - Hjorth, M.
AU - Justesen, A. B.
AU - Hirano, T.
AU - Albrecht, S.
AU - Gandolfi, D.
AU - Dai, F.
AU - Alonso, R.
AU - Barragán, O.
AU - Esposito, M.
AU - Kuzuhara, M.
AU - Lam, K. W.F.
AU - Livingston, J. H.
AU - Montanes-Rodriguez, P.
AU - Narita, N.
AU - Nowak, G.
AU - Prieto-Arranz, J.
AU - Redfield, S.
AU - Rodler, F.
AU - Van Eylen, V.
AU - Winn, J. N.
AU - Antoniciello, G.
AU - Cabrera, J.
AU - Cochran, W. D.
AU - Csizmadia, Sz
AU - De Leon, J.
AU - Deeg, H.
AU - Eigmüller, Ph
AU - Endl, M.
AU - Erikson, A.
AU - Fridlund, M.
AU - Grziwa, S.
AU - Guenther, E.
AU - Hatzes, A. P.
AU - Heeren, P.
AU - Hidalgo, D.
AU - Korth, J.
AU - Luque, R.
AU - Nespral, D.
AU - Palle, E.
AU - Pätzold, M.
AU - Persson, C. M.
AU - Rauer, H.
AU - Smith, A. M.S.
AU - Trifonov, T.
N1 - Funding Information: We are very grateful for the helpful comments and suggestions from the anonymous referee, which improved the quality of the paper. We also give our sincerest thanks to amateur astronomers Phil Evans and Chris Stockdale for their effort in obtaining ground-based photometry during transit of K2-290c. MH, ABJ, and SA acknowledge the support from the Danish Council for Independent Research through the DFF Sapere Aude Starting Grant No. 4181-00487B, and the Stellar Astrophysics Centre which funding is provided by The Danish National Research Foundation (Grant agreement no.: DNRF106). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 730890. This material reflects only the authors’ views and the Commission is not liable for any use that may be made of the information contained therein. The work was also supported by Japan Society for Promotion of Science (JSPS) KAKENHI Grant Number JP16K17660 and partly supported by JSPS KAKENHI Grant Number JP18H01265. ME acknowledges the support of the DFG priority program SPP 1992 ‘Exploring the Diversity of Extrasolar Planets’ (HA 3279/12-1). This paper includes data collected by the K2 mission. Funding for the K2 mission is provided by the NASA Science Mission directorate. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The radial velocity observations were made with (1) the Nordic Optical Telescope (NOT), operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias as part of the Nordic and OPTICON programmes 57-015 and 2018A/044, (2) the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 0100.C-0808 and 0101.C-0829 and (3) the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias as part of the Spanish and TAC programmes CAT17B 99, CAT18A 130, and A37TAC 37. The AO imaging was based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan as part of the programme S18A-089. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This work uses results from the European Space Agency (ESA) space mission Gaia. Gaia data are being processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC is provided by national institutions, in particular the institutions participating in the Gaia MultiLateral Agreement (MLA). The Gaia mission website is https://cosmos.esa.int/gaia. The Gaia archive website is https://archives.esac.esa.int/gaia. IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. Funding Information: We are very grateful for the helpful comments and suggestions from the anonymous referee, which improved the quality of the paper. We also give our sincerest thanks to amateur astronomers Phil Evans and Chris Stockdale for their effort in obtaining ground-based photometry during transit of K2-290c. MH, ABJ, and SA acknowledge the support from the Danish Council for Independent Research through the DFF Sapere Aude Starting Grant No. 4181-00487B, and the Stellar Astrophysics Centre which funding is provided by The Danish National Research Foundation (Grant agreement no.: DNRF106). This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 730890. This material reflects only the authors' views and the Commission is not liable for any use that may be made of the information contained therein. The work was also supported by Japan Society for Promotion of Science (JSPS) KAKENHI Grant Number JP16K17660 and partly supported by JSPS KAKENHI Grant Number JP18H01265. ME acknowledges the support of the DFG priority program SPP 1992 'Exploring the Diversity of Extrasolar Planets' (HA 3279/12-1). This paper includes data collected by the K2 mission. Funding for the K2 mission is provided by the NASA Science Mission directorate. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The radial velocity observations were made with (1) the Nordic Optical Telescope (NOT), operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias as part of the Nordic and OPTICON programmes 57-015 and 2018A/044, (2) the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 0100.C-0808 and 0101.C-0829 and (3) the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias as part of the Spanish and TAC programmes CAT17B 99, CAT18A 130, and A37TAC 37. The AO imaging was based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan as part of the programme S18A-089. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This work uses results from the European Space Agency (ESA) space mission Gaia. Gaia data are being processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC is provided by national institutions, in particular the institutions participating in the Gaia MultiLateral Agreement (MLA). The Gaia mission website is https://cosmos.esa.int/gaia. The Gaia archive website is https://archives.esac.esa.int/gaia. IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. Publisher Copyright: © 2019 The Author(s)
PY - 2019/4/11
Y1 - 2019/4/11
N2 - We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AO imaging and Gaia data we identify two M-dwarf companions at a separation of 113 ± 2 and 2467+−177155 au. From radial velocities, K2 photometry, and stellar characterization of the host star, we find the inner planet to be a mini-Neptune with a radius of 3.06 ± 0.16 R and an orbital period of P = 9.2 d. The radius of the mini-Neptune suggests that the planet is located above the radius valley, and with an incident flux of F ∼ 400 F, it lies safely outside the super-Earth desert. The outer warm Jupiter has a mass of 0.774 ± 0.047 MJ and a radius of 1.006 ± 0.050 RJ, and orbits the host star every 48.4 d on an orbit with an eccentricity e < 0.241. Its mild eccentricity and mini-Neptune sibling suggest that the warm Jupiter originates from in situ formation or disc migration.
AB - We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AO imaging and Gaia data we identify two M-dwarf companions at a separation of 113 ± 2 and 2467+−177155 au. From radial velocities, K2 photometry, and stellar characterization of the host star, we find the inner planet to be a mini-Neptune with a radius of 3.06 ± 0.16 R and an orbital period of P = 9.2 d. The radius of the mini-Neptune suggests that the planet is located above the radius valley, and with an incident flux of F ∼ 400 F, it lies safely outside the super-Earth desert. The outer warm Jupiter has a mass of 0.774 ± 0.047 MJ and a radius of 1.006 ± 0.050 RJ, and orbits the host star every 48.4 d on an orbit with an eccentricity e < 0.241. Its mild eccentricity and mini-Neptune sibling suggest that the warm Jupiter originates from in situ formation or disc migration.
KW - Planets
KW - Planets and satellites: detection
KW - Planets and satellites: formation
KW - Planets and satellites: individual: K2-290
KW - Satellites: individual: EPIC 249624646
UR - http://www.scopus.com/inward/record.url?scp=85067056184&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85067056184&partnerID=8YFLogxK
U2 - 10.1093/mnras/stz139
DO - 10.1093/mnras/stz139
M3 - Article
AN - SCOPUS:85067056184
SN - 0035-8711
VL - 484
SP - 3522
EP - 3536
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -