The Extreme Stellar-signals Project. III. Combining Solar Data from HARPS, HARPS-N, EXPRES, and NEID

• Type: Article in International Scientific Journal
• Date: 2023

Authors

Zhao, LL (Author) Other; Dumusque, X (Author) Other; Ford, EB (Author) Other; Llama, J (Author) Other; Mortier, A (Author) Other; Bedell, M (Author) Other; Al Moulla, K (Author) Other; Bender, CF (Author) Other; Blake, CH (Author) Other; Brewer, JM (Author) Other; Cameron, AC (Author) Other; Cosentino, R (Author) Other; Figueira, P (Author) Other; Fischer, DA (Author) Other; Ghedina, A (Author) Other; Gonzalez, M (Author) Other; Halverson, S (Author) Other; Kanodia, S (Author) Other; Latham, DW (Author) Other; Lin, ASJ (Author) Other; Lo Curto, G (Author) Other; Lodi, M (Author) Other; Logsdon, SE (Author) Other; Lovis, C (Author) Other; Mahadevan, S (Author) Other; Monson, A (Author) Other; Ninan, JP (Author) Other; Pepe, F (Author) Other; Roettenbacher, RM (Author) Other; Roy, A (Author) Other; N.C. Santos (Author) FCUP; Schwab, C (Author) Other; Stefánsson, G (Author) Other; Szymkowiak, AE (Author) Other; Terrien, RC (Author) Other; Udry, S (Author) Other; Weiss, SA (Author) Other; Wildi, F (Author) Other; Wildi, T (Author) Other; Wright, JT (Author) Other

Journal

Title: Astronomical Journal

Vol. 166

Final page: 173

ISSN: 0004-6256

Publisher: American Astronomical Society

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 2 Citations

Other information

Authenticus ID: P-00Z-8G5

DOI: 10.3847/1538-3881/acf83e

Abstract (EN): We present an analysis of Sun-as-a-star observations from four different high-resolution, stabilized spectrographs-HARPS, HARPS-N, EXPRES, and NEID. With simultaneous observations of the Sun from four different instruments, we are able to gain insight into the radial velocity precision and accuracy delivered by each of these instruments and isolate instrumental systematics that differ from true astrophysical signals. With solar observations, we can completely characterize the expected Doppler shift contributed by orbiting Solar System bodies and remove them. This results in a data set with measured velocity variations that purely trace flows on the solar surface. Direct comparisons of the radial velocities measured by each instrument show remarkable agreement with residual intraday scatter of only 15-30 cm s-1. This shows that current ultra-stabilized instruments have broken through to a new level of measurement precision that reveals stellar variability with high fidelity and detail. We end by discussing how radial velocities from different instruments can be combined to provide powerful leverage for testing techniques to mitigate stellar signals.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17