Radial-velocity Precision of ESPRESSO Through the Analysis of the Solar Twin HIP 11915

Autor(es)

Netto, Yuri ^[1] ; Lorenzo-Oliveira, Diego ^[1] ; Melendez, Jorge ^[1] ; Yana Galarza, Jhon ^[1] ; Haywood, Raphaelle D. ^[2] ; Spina, Lorenzo ^[3] ; dos Santos, Leonardo A. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer IAG, Dept Astron, Rua Matao 1226, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ Exeter, Astrophys Grp, Exeter EX4 4QL, Devon - England

^[3] INAF Osservatorio Astronom Padova, Vicolo Osservatorio 5, I-35122 Padua - Italy

^[4] Univ Geneva, Observ Astron, Chemin Pegasi 51, CH-1290 Versoix - Switzerland

• Tipo de documento: Artigo Científico
• Fonte: ASTRONOMICAL JOURNAL; v. 162, n. 4 OCT 2021.
• Citações Web of Science: 0

Resumo

Different stellar phenomena affect radial velocities (RVs), causing variations large enough to make it difficult to identify planet signals from the stellar variability. RV variations caused by stellar oscillations and granulation can be reduced through some methods, but the impact of rotationally modulated magnetic activity on RV, due to stellar active regions, is harder to correct. New instrumentation promises an improvement in precision of one order of magnitude, from about 1 m s(-1) to about 10 cm s(-1). In this context, we report our first results from 24 spectroscopic Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO)/Very-Large Telescope observations of the solar twin star HIP 11915, spread over 60 nights. We used a Gaussian Process approach and found for HIP 11915 a RV residual rms scatter of about 20 cm s(-1), representing an upper limit for the performance of ESPRESSO. (AU)

• Processo FAPESP: 18/04055-8 - Espectroscopia de alta precisão: das primeiras estrelas aos planetas
• Beneficiário: Jorge Luis Melendez Moreno
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/20319-8 - Modelando as assinaturas espectroscópicas de atividade estelar
• Beneficiário: Dirceu Yuri Simplicio Netto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/20667-8 - Cronômetros estelares: a conexão entre idade, atividade cromosférica, rotação e abundâncias de lítio em estrelas de tipo solar
• Beneficiário: Diego Lorenzo de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado