A crucial test for astronomical spectrograph calibration with frequency combs

Bibcode
2020NatAs...4..603P
DOI
10.1038/s41550-020-1010-x
Probst, Rafael A.; Milaković, Dinko; Toledo-Padrón, Borja; Lo Curto, Gaspare; Avila, Gerardo; Brucalassi, Anna; Canto Martins, Bruno L.; de Castro Leão, Izan; Esposito, Massimiliano; González Hernández, Jonay I.; Grupp, Frank; Hänsch, Theodor W.; Kellermann, Hanna; Kerber, Florian; Mandel, Olaf; Manescau, Antonio; Pozna, Eszter; Rebolo, Rafael; de Medeiros, José R.; Steinmetz, Tilo; Suárez Mascareño, Alejandro; Udem, Thomas; Urrutia, Josefina; Wu, Yuanjie; Pasquini, Luca; Holzwarth, Ronald
Referencia bibliográfica

Nature Astronomy

Fecha de publicación:
2
2020
Número de autores
26
Número de autores del IAC
5
Número de citas
25
Número de citas referidas
21
Descripción
Laser frequency combs (LFCs) are well on their way to becoming the next-generation calibration sources for precision astronomical spectroscopy1-6. This development is considered key in the hunt for low-mass rocky exoplanets around solar-type stars whose discovery with the radial-velocity method requires cm s-1 Doppler precision7. In order to prove such precise calibration with an LFC, it must be compared to another calibrator of at least the same precision. Being the best available spectrograph calibrator, this means comparing it to a second—fully independent—LFC. Here, we report on a test in which two separate LFCs were used to simultaneously calibrate an astronomical spectrograph. Our installation of two LFCs at the ultra-stable two-channel spectrograph HARPS allowed characterization of their relative stability and consistency in calibration at the highest available level. Although the test was limited in time, the results confirm the 1 cm s-1 stability that has long been anticipated by the astronomical community.
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Estrellas de Baja Masa, Enanas Marrones y Planetas

Se investigan los procesos que conducen a la formación de estrellas de baja masa, enanas marrones y exoplanetas y caracterizar las propiedades físicas de estos astros en varias etapas evolutivas. Las estrellas de muy baja masa y las enanas marrones son probablemente los objetos más numerosos de nuestra Galaxia, pero no por ello están

Rafael
Rebolo López
En ejecución
Tipo
Con árbitro
Física estelar e interestelar (FEEI)

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