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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 7
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: ASTRONOMICAL JOURNAL; v. 162, n. 4 OCT 2021.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 18/04055-8 - High precision spectroscopy: from the first stars to planets
Grantee:Jorge Luis Melendez Moreno
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/20319-8 - Modeling spectroscopic signatures of stellar activity
Grantee:Dirceu Yuri Simplicio Netto
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 16/20667-8 - Stellar chronometers: the relation between age, chromospheric activity, rotation and lithium abundances in solar-type stars
Grantee:Diego Lorenzo de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral