The CARMENES search for exoplanets around M dwarfs: The warm
super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779)
and LP 819-052 (GJ 1265)
We announce the discovery of two planetary companions orbiting around the low
mass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V). The
discovery is based on the analysis of CARMENES radial velocity observations in
the visual channel as part of its survey for exoplanets around M dwarfs. In the
case of GJ 1265, CARMENES observations were complemented with publicly
available Doppler measurements from HARPS. The datasets reveal one planetary
companion for each star that share very similar properties: minimum masses of
$8.0\pm0.5$ M$_øplus$ and $7.4\pm0.5$ M$_øplus$ in low-eccentricity
orbits with periods of $3.023\pm0.001$ d and $3.651\pm0.001$ d for GJ 3779 b
and GJ 1265 b, respectively. The periodic signals around three days found in
the radial velocity data have no counterpart in any spectral activity
indicator. Besides, we collected available photometric data for the two host
stars, which confirm that the additional Doppler variations found at periods
around 95 d can be attributed to the rotation of the stars. The addition of
these planets in a mass-period diagram of known planets around M dwarfs
suggests a bimodal distribution with a lack of short-period low-mass planets in
the range of 2-5 M$_øplus$. It also indicates that super-Earths (> 5
M$_øplus$) currently detected by radial velocity and transit techniques
around M stars are usually found in systems dominated by a single planet.
Description
The CARMENES search for exoplanets around M dwarfs: The warm
super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779)
and LP 819-052 (GJ 1265)
%0 Generic
%1 luque2018carmenes
%A Luque, R.
%A Nowak, G.
%A Pallé, E.
%A Kossakowski, D.
%A Trifonov, T.
%A Zechmeister, M.
%A Béjar, V. J. S.
%A Guillén, C. Cardona
%A Tal-Or, L.
%A Hidalgo, D.
%A Ribas, I.
%A Reiners, A.
%A Caballero, J. A.
%A Amado, P. J.
%A Quirrenbach, A.
%A Aceituno, J.
%A Cortés-Contreras, M.
%A Díez-Alonso, E.
%A Dreizler, S.
%A Guenther, E. W.
%A Henning, T.
%A Jeffers, S. V.
%A Kaminski, A.
%A Kürster, M.
%A Lafarga, M.
%A Montes, D.
%A Morales, J. C.
%A Passegger, V. M.
%A Schmitt, J. H. M. M.
%A Schweitzer, A.
%D 2018
%K exoplanet mdwarf
%T The CARMENES search for exoplanets around M dwarfs: The warm
super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779)
and LP 819-052 (GJ 1265)
%U http://arxiv.org/abs/1810.07572
%X We announce the discovery of two planetary companions orbiting around the low
mass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V). The
discovery is based on the analysis of CARMENES radial velocity observations in
the visual channel as part of its survey for exoplanets around M dwarfs. In the
case of GJ 1265, CARMENES observations were complemented with publicly
available Doppler measurements from HARPS. The datasets reveal one planetary
companion for each star that share very similar properties: minimum masses of
$8.0\pm0.5$ M$_øplus$ and $7.4\pm0.5$ M$_øplus$ in low-eccentricity
orbits with periods of $3.023\pm0.001$ d and $3.651\pm0.001$ d for GJ 3779 b
and GJ 1265 b, respectively. The periodic signals around three days found in
the radial velocity data have no counterpart in any spectral activity
indicator. Besides, we collected available photometric data for the two host
stars, which confirm that the additional Doppler variations found at periods
around 95 d can be attributed to the rotation of the stars. The addition of
these planets in a mass-period diagram of known planets around M dwarfs
suggests a bimodal distribution with a lack of short-period low-mass planets in
the range of 2-5 M$_øplus$. It also indicates that super-Earths (> 5
M$_øplus$) currently detected by radial velocity and transit techniques
around M stars are usually found in systems dominated by a single planet.
@misc{luque2018carmenes,
abstract = {We announce the discovery of two planetary companions orbiting around the low
mass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V). The
discovery is based on the analysis of CARMENES radial velocity observations in
the visual channel as part of its survey for exoplanets around M dwarfs. In the
case of GJ 1265, CARMENES observations were complemented with publicly
available Doppler measurements from HARPS. The datasets reveal one planetary
companion for each star that share very similar properties: minimum masses of
$8.0\pm0.5$ M$_{\oplus}$ and $7.4\pm0.5$ M$_{\oplus}$ in low-eccentricity
orbits with periods of $3.023\pm0.001$ d and $3.651\pm0.001$ d for GJ 3779 b
and GJ 1265 b, respectively. The periodic signals around three days found in
the radial velocity data have no counterpart in any spectral activity
indicator. Besides, we collected available photometric data for the two host
stars, which confirm that the additional Doppler variations found at periods
around 95 d can be attributed to the rotation of the stars. The addition of
these planets in a mass-period diagram of known planets around M dwarfs
suggests a bimodal distribution with a lack of short-period low-mass planets in
the range of 2-5 M$_{\oplus}$. It also indicates that super-Earths (> 5
M$_{\oplus}$) currently detected by radial velocity and transit techniques
around M stars are usually found in systems dominated by a single planet.},
added-at = {2018-10-18T18:23:49.000+0200},
author = {Luque, R. and Nowak, G. and Pallé, E. and Kossakowski, D. and Trifonov, T. and Zechmeister, M. and Béjar, V. J. S. and Guillén, C. Cardona and Tal-Or, L. and Hidalgo, D. and Ribas, I. and Reiners, A. and Caballero, J. A. and Amado, P. J. and Quirrenbach, A. and Aceituno, J. and Cortés-Contreras, M. and Díez-Alonso, E. and Dreizler, S. and Guenther, E. W. and Henning, T. and Jeffers, S. V. and Kaminski, A. and Kürster, M. and Lafarga, M. and Montes, D. and Morales, J. C. and Passegger, V. M. and Schmitt, J. H. M. M. and Schweitzer, A.},
biburl = {https://www.bibsonomy.org/bibtex/29c9b11e9a12750a4b4122139deb75aaa/superjenwinters},
description = {The CARMENES search for exoplanets around M dwarfs: The warm
super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779)
and LP 819-052 (GJ 1265)},
interhash = {000f5d16daf69f43beb848f786ff72bf},
intrahash = {9c9b11e9a12750a4b4122139deb75aaa},
keywords = {exoplanet mdwarf},
note = {cite arxiv:1810.07572Comment: Accepted for publication in A&A. 15 pages, 12 figures, 4 tables},
timestamp = {2018-10-18T18:23:49.000+0200},
title = {The CARMENES search for exoplanets around M dwarfs: The warm
super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779)
and LP 819-052 (GJ 1265)},
url = {http://arxiv.org/abs/1810.07572},
year = 2018
}