The CARMENES search for exoplanets around M dwarfs: Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)

S. Lalitha; D. Baroch; J. C. Morales; V. M. Passegger; F. F. Bauer; C. Cardona Guillén; S. Dreizler; M. Oshagh; A. Reiners; I. Ribas; J. A. Caballero; A. Quirrenbach; P. J. Amado; V. J.S. Béjar; J. Colomé; M. Cortés-Contreras; D. Galadí-Enríquez; L. González-Cuesta; E. W. Guenther; H. J. Hagen; T. Henning; E. Herrero; T. O. Husser; S. V. Jeffers; A. Kaminski; M. Kürster; M. Lafarga; N. Lodieu; M. J. López-González; D. Montes; M. Perger; A. Rosich; E. Rodríguez; C. Rodríguez-López; J. H.M.M. Schmitt; L. Tal-Or; M. Zechmeister

doi:10.1051/0004-6361/201935534

The CARMENES search for exoplanets around M dwarfs: Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)

S. Lalitha, D. Baroch, J. C. Morales, V. M. Passegger, F. F. Bauer, C. Cardona Guillén, S. Dreizler, M. Oshagh, A. Reiners, I. Ribas, J. A. Caballero, A. Quirrenbach, P. J. Amado, V. J.S. Béjar, J. Colomé, M. Cortés-Contreras, D. Galadí-Enríquez, L. González-Cuesta, E. W. Guenther, H. J. HagenT. Henning, E. Herrero, T. O. Husser, S. V. Jeffers, A. Kaminski, M. Kürster, M. Lafarga, N. Lodieu, M. J. López-González, D. Montes, M. Perger, A. Rosich, E. Rodríguez, C. Rodríguez-López, J. H.M.M. Schmitt, L. Tal-Or, M. Zechmeister

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Abstract

Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the planet around LSPM J2116+0234 is based on CARMENES RV observations in the visual and near-infrared channels. We confirm the planet orbiting around GJ 686 by analyzing the RV data spanning over two decades of observationsfrom CARMENES VIS, HARPS-N, HARPS, and HIRES. We find planetary signals at 14.44 and 15.53 d in the RV data for LSPM J2116+0234 and GJ 686, respectively. Additionally, the RV, photometric time series, and various spectroscopic indicators show hints of variations of 42 d for LSPM J2116+0234 and 37 d for GJ 686, which we attribute to the stellar rotation periods. The orbital parameters of the planets are modeled with Keplerian fits together with correlated noise from the stellar activity. A mini-Neptune with a minimum mass of 11.8 M_⊙ orbits LSPM J2116+0234 producing a RV semi-amplitude of 6.19 m s^-1, while a super-Earth of mass 6.6 M_⊙ orbits GJ 686 and produces a RV semi-amplitude of 3.0 m s^-1. Both LSPM J2116+0234 and GJ 686 have planetary companions populating the regime of exoplanets with masses lower than 15 M_⊙ and orbital periods <20 d.

Original language	English
Article number	A116
Journal	Astronomy and Astrophysics
Volume	627
DOIs	https://doi.org/10.1051/0004-6361/201935534
State	Published - 1 Jul 2019
Externally published	Yes

Keywords

Planetary systems
Stars: activity
Stars: individual: GJ 686
Stars: individual: LSPM J2116+0234
Stars: low-mass
Techniques: radial velocities

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10.1051/0004-6361/201935534

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Lalitha, S., Baroch, D., Morales, J. C., Passegger, V. M., Bauer, F. F., Cardona Guillén, C., Dreizler, S., Oshagh, M., Reiners, A., Ribas, I., Caballero, J. A., Quirrenbach, A., Amado, P. J., Béjar, V. J. S., Colomé, J., Cortés-Contreras, M., Galadí-Enríquez, D., González-Cuesta, L., Guenther, E. W., ... Zechmeister, M. (2019). The CARMENES search for exoplanets around M dwarfs: Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421). Astronomy and Astrophysics, 627, Article A116. https://doi.org/10.1051/0004-6361/201935534

@article{026b3b3f7cd04c89bea36ed32abebd7b,

title = "The CARMENES search for exoplanets around M dwarfs: Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)",

abstract = "Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the planet around LSPM J2116+0234 is based on CARMENES RV observations in the visual and near-infrared channels. We confirm the planet orbiting around GJ 686 by analyzing the RV data spanning over two decades of observationsfrom CARMENES VIS, HARPS-N, HARPS, and HIRES. We find planetary signals at 14.44 and 15.53 d in the RV data for LSPM J2116+0234 and GJ 686, respectively. Additionally, the RV, photometric time series, and various spectroscopic indicators show hints of variations of 42 d for LSPM J2116+0234 and 37 d for GJ 686, which we attribute to the stellar rotation periods. The orbital parameters of the planets are modeled with Keplerian fits together with correlated noise from the stellar activity. A mini-Neptune with a minimum mass of 11.8 M⊙ orbits LSPM J2116+0234 producing a RV semi-amplitude of 6.19 m s-1, while a super-Earth of mass 6.6 M⊙ orbits GJ 686 and produces a RV semi-amplitude of 3.0 m s-1. Both LSPM J2116+0234 and GJ 686 have planetary companions populating the regime of exoplanets with masses lower than 15 M⊙ and orbital periods <20 d.",

keywords = "Planetary systems, Stars: activity, Stars: individual: GJ 686, Stars: individual: LSPM J2116+0234, Stars: low-mass, Techniques: radial velocities",

author = "S. Lalitha and D. Baroch and Morales, {J. C.} and Passegger, {V. M.} and Bauer, {F. F.} and {Cardona Guill{\'e}n}, C. and S. Dreizler and M. Oshagh and A. Reiners and I. Ribas and Caballero, {J. A.} and A. Quirrenbach and Amado, {P. J.} and B{\'e}jar, {V. J.S.} and J. Colom{\'e} and M. Cort{\'e}s-Contreras and D. Galad{\'i}-Enr{\'i}quez and L. Gonz{\'a}lez-Cuesta and Guenther, {E. W.} and Hagen, {H. J.} and T. Henning and E. Herrero and Husser, {T. O.} and Jeffers, {S. V.} and A. Kaminski and M. K{\"u}rster and M. Lafarga and N. Lodieu and L{\'o}pez-Gonz{\'a}lez, {M. J.} and D. Montes and M. Perger and A. Rosich and E. Rodr{\'i}guez and C. Rodr{\'i}guez-L{\'o}pez and Schmitt, {J. H.M.M.} and L. Tal-Or and M. Zechmeister",

note = "Publisher Copyright: {\textcopyright} ESO 2019.",

year = "2019",

month = jul,

day = "1",

doi = "10.1051/0004-6361/201935534",

language = "אנגלית",

volume = "627",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Lalitha, S, Baroch, D, Morales, JC, Passegger, VM, Bauer, FF, Cardona Guillén, C, Dreizler, S, Oshagh, M, Reiners, A, Ribas, I, Caballero, JA, Quirrenbach, A, Amado, PJ, Béjar, VJS, Colomé, J, Cortés-Contreras, M, Galadí-Enríquez, D, González-Cuesta, L, Guenther, EW, Hagen, HJ, Henning, T, Herrero, E, Husser, TO, Jeffers, SV, Kaminski, A, Kürster, M, Lafarga, M, Lodieu, N, López-González, MJ, Montes, D, Perger, M, Rosich, A, Rodríguez, E, Rodríguez-López, C, Schmitt, JHMM, Tal-Or, L & Zechmeister, M 2019, 'The CARMENES search for exoplanets around M dwarfs: Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)', Astronomy and Astrophysics, vol. 627, A116. https://doi.org/10.1051/0004-6361/201935534

TY - JOUR

T1 - The CARMENES search for exoplanets around M dwarfs

T2 - Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)

AU - Lalitha, S.

AU - Baroch, D.

AU - Morales, J. C.

AU - Passegger, V. M.

AU - Bauer, F. F.

AU - Cardona Guillén, C.

AU - Dreizler, S.

AU - Oshagh, M.

AU - Reiners, A.

AU - Ribas, I.

AU - Caballero, J. A.

AU - Quirrenbach, A.

AU - Amado, P. J.

AU - Béjar, V. J.S.

AU - Colomé, J.

AU - Cortés-Contreras, M.

AU - Galadí-Enríquez, D.

AU - González-Cuesta, L.

AU - Guenther, E. W.

AU - Hagen, H. J.

AU - Henning, T.

AU - Herrero, E.

AU - Husser, T. O.

AU - Jeffers, S. V.

AU - Kaminski, A.

AU - Kürster, M.

AU - Lafarga, M.

AU - Lodieu, N.

AU - López-González, M. J.

AU - Montes, D.

AU - Perger, M.

AU - Rosich, A.

AU - Rodríguez, E.

AU - Rodríguez-López, C.

AU - Schmitt, J. H.M.M.

AU - Tal-Or, L.

AU - Zechmeister, M.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the planet around LSPM J2116+0234 is based on CARMENES RV observations in the visual and near-infrared channels. We confirm the planet orbiting around GJ 686 by analyzing the RV data spanning over two decades of observationsfrom CARMENES VIS, HARPS-N, HARPS, and HIRES. We find planetary signals at 14.44 and 15.53 d in the RV data for LSPM J2116+0234 and GJ 686, respectively. Additionally, the RV, photometric time series, and various spectroscopic indicators show hints of variations of 42 d for LSPM J2116+0234 and 37 d for GJ 686, which we attribute to the stellar rotation periods. The orbital parameters of the planets are modeled with Keplerian fits together with correlated noise from the stellar activity. A mini-Neptune with a minimum mass of 11.8 M⊙ orbits LSPM J2116+0234 producing a RV semi-amplitude of 6.19 m s-1, while a super-Earth of mass 6.6 M⊙ orbits GJ 686 and produces a RV semi-amplitude of 3.0 m s-1. Both LSPM J2116+0234 and GJ 686 have planetary companions populating the regime of exoplanets with masses lower than 15 M⊙ and orbital periods <20 d.

AB - Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the planet around LSPM J2116+0234 is based on CARMENES RV observations in the visual and near-infrared channels. We confirm the planet orbiting around GJ 686 by analyzing the RV data spanning over two decades of observationsfrom CARMENES VIS, HARPS-N, HARPS, and HIRES. We find planetary signals at 14.44 and 15.53 d in the RV data for LSPM J2116+0234 and GJ 686, respectively. Additionally, the RV, photometric time series, and various spectroscopic indicators show hints of variations of 42 d for LSPM J2116+0234 and 37 d for GJ 686, which we attribute to the stellar rotation periods. The orbital parameters of the planets are modeled with Keplerian fits together with correlated noise from the stellar activity. A mini-Neptune with a minimum mass of 11.8 M⊙ orbits LSPM J2116+0234 producing a RV semi-amplitude of 6.19 m s-1, while a super-Earth of mass 6.6 M⊙ orbits GJ 686 and produces a RV semi-amplitude of 3.0 m s-1. Both LSPM J2116+0234 and GJ 686 have planetary companions populating the regime of exoplanets with masses lower than 15 M⊙ and orbital periods <20 d.

KW - Planetary systems

KW - Stars: activity

KW - Stars: individual: GJ 686

KW - Stars: individual: LSPM J2116+0234

KW - Stars: low-mass

KW - Techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85069773192&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201935534

DO - 10.1051/0004-6361/201935534

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AN - SCOPUS:85069773192

SN - 0004-6361

VL - 627

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A116

ER -

The CARMENES search for exoplanets around M dwarfs: Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)

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