Gaia Data Release 3. Reflectance spectra of Solar System small bodies

Galluccio, L., Delbo, M., Angeli, F. De y Sarro Baro, Luis Manuel . (2023) Gaia Data Release 3. Reflectance spectra of Solar System small bodies. Astronomy & Astrophysics Vol 674, A35

Ficheros (Some files may be inaccessible until you login with your e-spacio credentials)
Nombre Descripción Tipo MIME Size
Sarro_Baro_Luis_Manuel_GDR3_Reflectance_spectra.pdf Sarro Baro_Luis Manuel_GDR3 Reflectance spectra.pdf application/pdf 10.75MB

Título Gaia Data Release 3. Reflectance spectra of Solar System small bodies
Autor(es) Galluccio, L.
Delbo, M.
Angeli, F. De
Sarro Baro, Luis Manuel
Materia(s) Ingeniería Informática
Abstract Context. The Gaia mission of the European Space Agency (ESA) has been routinely observing Solar System objects (SSOs) since the beginning of its operations in August 2014. The Gaia data release three (DR3) includes, for the first time, the mean reflectance spectra of a selected sample of 60 518 SSOs, primarily asteroids, observed between August 5, 2014, and May 28, 2017. Each reflectance spectrum was derived from measurements obtained by means of the Blue and Red photometers (BP/RP), which were binned in 16 discrete wavelength bands. For every spectrum, the DR3 also contains additional information about the data quality for each band. Aims. We describe the processing of the Gaia spectral data of SSOs, explaining both the criteria used to select the subset of asteroid spectra published in Gaia DR3, and the different steps of our internal validation procedures. In order to further assess the quality of Gaia SSO reflectance spectra, we carried out external validation against SSO reflectance spectra obtained from ground-based and space-borne telescopes and available in the literature; we present our validation approach. Methods. For each selected SSO, an epoch reflectance was computed by dividing the calibrated spectrum observed by the BP/RP at each transit on the focal plane by the mean spectrum of a solar analogue. The latter was obtained by averaging the Gaia spectral measurements of a selected sample of stars known to have very similar spectra to that of the Sun. Finally, a mean of the epoch reflectance spectra was calculated in 16 spectral bands for each SSO. Results. Gaia SSO reflectance spectra are in general agreement with those obtained from a ground-based spectroscopic campaign specifically designed to cover the same spectral interval as Gaia and mimic the illumination and observing geometry characterising Gaia SSO observations. In addition, the agreement between Gaia mean reflectance spectra and those available in the literature is good for bright SSOs, regardless of their taxonomic spectral class. We identify an increase in the spectral slope of S-type SSOs with increasing phase angle. Moreover, we show that the spectral slope increases and the depth of the 1 um absorption band decreases for increasing ages of S-type asteroid families. The latter can be interpreted as proof of progressive ageing of S-type asteroid surfaces due to their exposure to space weathering eects.
Palabras clave minor planets
asteroids: general
techniques: spectroscopic
Editor(es) EDP Sciences
Fecha 2023-06-16
Formato application/pdf
Identificador bibliuned:95-Lmsarro-0014
http://e-spacio.uned.es/fez/view/bibliuned:95-Lmsarro-0014
DOI - identifier https://doi.org/10.1051/0004-6361/202243791
ISSN - identifier 1432-0746
Nombre de la revista Astronomy & Astrophysics (A&A)
Número de Volumen 674
Número de Issue A35
Publicado en la Revista Astronomy & Astrophysics Vol 674, A35
Idioma eng
Versión de la publicación publishedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Astronomy & Astrophysics (2023) Vol. 674, A35, está disponible en línea en el sitio web del editor: EDP Sciences, https://doi.org/10.1051/0004-6361/202243791
Notas adicionales The registered version of this paper, first published in Astronomy & Astrophysics (2023) Vol.674, A35, is available online at the publisher's website: EDP Sciences, https://doi.org/10.1051/0004-6361/202243791

 
Versiones
Versión Tipo de filtro
Contador de citas: Google Scholar Search Google Scholar
Estadísticas de acceso: 38 Visitas, 5 Descargas  -  Estadísticas en detalle
Creado: Tue, 12 Mar 2024, 22:47:59 CET