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DOI | 10.1051/0004-6361/202038555 | ||||
Año | 2021 | ||||
Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We report the discovery of planetary companions orbiting four low-luminosity giant stars with M-star between 1.04 and 1.39 M-circle dot. All four host stars have been independently observed by the EXoPlanets aRound Evolved StarS (EXPRESS) program and the Pan-Pacific Planet Search (PPPS). The companion signals were revealed by multi-epoch precision radial velocities obtained in nearly a decade. The planetary companions exhibit orbital periods between similar to 1.2 and 7.1 yr, minimum masses of m(p)sin i similar to 1.8-3.7 M-J, and eccentricities between 0.08 and 0.42. With these four new systems, we have detected planetary companions to 11 out of the 37 giant stars that are common targets in the EXPRESS and PPPS. After excluding four compact binaries from the common sample, we obtained a fraction of giant planets (m(p) greater than or similar to 1- 2 M-J) orbiting within 5 AU from their parent star of f = 33.3(-7.1)(+9.0)%. This fraction is slightly higher than but consistent at the 1 sigma level with previous results obtained by different radial velocity surveys. Finally, this value is substantially higher than the fraction predicted by planet formation models of gas giants around stars more massive than the Sun.
Ord. | Autor | Género | Institución - País |
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1 | Jones, M. | Hombre |
ESO - Chile
Universidad Católica del Norte - Chile European Southern Observatory Santiago - Chile |
2 | Wittenmyer, R. | - |
Univ Southern Queensland - Australia
University of Southern Queensland - Australia |
3 | Aguilera-Gomez, Claudia | Mujer |
Universidad Nacional Andrés Bello - Chile
Pontificia Universidad Católica de Chile - Chile |
4 | SOTO-VASQUEZ, MARITZA GABRIELA | Mujer |
Queen Mary Univ - Reino Unido
Queen Mary University of London - Reino Unido |
5 | Torres-Miranda, Pascal | Hombre |
Pontificia Universidad Católica de Chile - Chile
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6 | Trifonov, T. | Hombre |
Max Planck Inst Astron - Alemania
Max Planck Institute for Astronomy - Alemania |
7 | JENKINS, JAMES STEWART | Hombre |
Universidad de Chile - Chile
Ctr Astrofis & Tecnol Afines CATA - Chile Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile |
8 | Zapata, A. | Hombre |
Pontificia Universidad Católica de Chile - Chile
|
9 | Sarkis, Paula | Mujer |
Max Planck Inst Astron - Alemania
Max Planck Institute for Astronomy - Alemania |
10 | Zakhozhay, Olga V. | Mujer |
Max Planck Inst Astron - Alemania
Natl Acad Sci Ukraine - Ucrania Max Planck Institute for Astronomy - Alemania Main Astronomical Observatory Nasu - Ucrania |
11 | BRAHM-SCOTT, RAFAEL ANDRES | Hombre |
Universidad Adolfo Ibáñez - Chile
Instituto Milenio de Astrofísica - Chile Millennium Institute for Astrophysics - Chile |
12 | Ramirez, R. | Hombre |
Universidad de Chile - Chile
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13 | SANTANA-ROJAS, FELIPE ANTONIO | Hombre |
Universidad de Chile - Chile
|
14 | Vines, Jose I. | Hombre |
Universidad de Chile - Chile
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15 | DIAZ-MUNOZ, MATIAS RODRIGO | Hombre |
Universidad de Chile - Chile
|
16 | Vuckovic, Maja | Mujer |
Universidad de Valparaíso - Chile
|
17 | Pantoja, B. | Hombre |
Bucknell Univ - Estados Unidos
Bucknell University - Estados Unidos |
Fuente |
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CONICYT-PFCHA |
Fondo Nacional de Desarrollo Científico y Tecnológico |
Comisión Nacional de Investigación Científica y Tecnológica |
FONDECYT grant |
CONICYT project Basal |
CONICYT-PFCHA/Doctorado Nacional, Chile |
Doctorado Nacional |
ANID |
National Agency for Research and Development |
National Agency for Research and Development (ANID) FONDECYT Postdoctoral Fellowship |
Doctorado Nacional-21140646 |
Agradecimiento |
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We acknowledge the traditional owners of the land on which the AAT stands, the Gamilaraay people, and pay our respects to elders past and present. C.A.G. acknowledges support from the National Agency for Research and Development (ANID) FONDECYT Postdoctoral Fellowship 2018 Project 3180668. J.S.J. acknowledges support by FONDECYT grant 1201371, and partial support from CONICYT project Basal AFB-170002. M.R.D. is supported by CONICYT-PFCHA/Doctorado Nacional-21140646, Chile. |
Acknolw edgements. We acknowledge the traditional owners of the land on which the AAT stands, the Gamilaraay people, and pay our respects to elders past and present. C.A.G. acknowledges support from the National Agency for Research and Development (ANID) FONDECYT Postdoctoral Fellowship 2018 Project 3180668. J.S.J. acknowledges support by FONDECYT grant 1201371, and partial support from CONICYT project Basal AFB-170002. M.R.D. is supported by CONICYT-PFCHA/Doctorado Nacional-21140646, Chile. |