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Characterizing some Gaia Alerts with LAMOST and SDSS
Huo, Z.1; Dennefeld, M.2,3; Liu, X.4; Pursimo, T.5; Zhang, T.1,6
2020-05-26
Source PublicationASTROPHYSICS AND SPACE SCIENCE
ISSN0004-640X
Volume365Issue:5Pages:18
AbstractThe ESA-Gaia satellite is regularly producing Alerts on objects where photometric variability has been detected after several passages over the same region of the sky. The physical nature of these objects has often to be determined with the help of complementary observations from ground-based facilities. We have compared the list of Gaia Alerts (from the beginning in 2014 to Nov. 1st, 2018) with archival LAMOST and SDSS spectroscopic data. A search radius of 3 '' has been adopted. In using survey data, the date of the ground-based observation rarely corresponds to the date of the Alert, but this allows at least the identification of the source if it is persistent, or the host galaxy if the object was only transient like a supernova (SN). Some of the objects have several LAMOST observations, and we complemented this search by adding also SDSS DR15 data in order to look for long-term variability. A list of Gaia Nuclear Transients (GNT) from Kostrzewa-Rutkowska et al. (Mon. Not. R. Astron. Soc. 481(1):307, 2018) has been included in this search also. We found 26 Gaia Alerts with spectra in LAMOST+SDSS labelled as stars, among which 12 have multi-epoch spectra. A majority of them are Cataclysmic Variables (CVs). Similarly, 206 Gaia Alerts have associated spectra labelled as galaxies, among which 49 have multi-epoch spectra. Those spectra were generally obtained on a date widely different from the Alert date, and are mostly emission-line galaxies with no particularity (except a few Seyferts), leading to the suspicion that most of the Alerts were due to a SN. As for the GNT list, we found 55 associated spectra labelled as galaxies, among them 13 with multi-epoch spectra. In these two galaxy samples, in only two cases, Gaia17aal and GNTJ170213+2543, was the date of the spectroscopic observation close enough to the Alert date: we find a trace of the SN itself in their LAMOST spectrum, both being now classified here as a type Ia SN. Compared to the galaxy sample from the Gaia alerts, the GNT sample has a higher proportion of AGNs, suggesting that some of the detected variations are also due to the AGN itself. Similarly for Quasars, we found only 30 Gaia Alerts but 68 GNT cases associated with single epoch quasar spectra in the databases. In addition to those, 12 plus 23 are quasars where multi-epoch spectra are available. For ten out of these 35, their multi-epoch spectra show appearance or disappearance of the broad Balmer lines and also variations in the continuum, qualifying them as "Changing Look Quasars" and therefore significantly increasing the available sample of such objects.
KeywordGaia Alerts Stars Galaxies Supernovae Quasars
Funding OrganizationSWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; SWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; SWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; SWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
DOI10.1007/s10509-020-03804-7
WOS KeywordDIGITAL SKY SURVEY ; CATACLYSMIC VARIABLES ; SPECTROSCOPIC SURVEY ; WHITE-DWARF ; RELEASE ; CLASSIFICATION ; SUPERHUMPS ; TELESCOPE ; SELECTION ; EMISSION
Language英语
Funding ProjectSWIFAR ; National Key Basic Research Program of China[2014CB845700] ; NSFC[11633002] ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration
Funding OrganizationSWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; SWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; SWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; SWIFAR ; SWIFAR ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000537776000001
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/83361
Collection中国科学院国家天文台
Corresponding AuthorDennefeld, M.
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 10101, Peoples R China
2.Inst Astrophys Paris IAP, 98bis Blvd Arago, F-75014 Paris, France
3.Sorbonne Univ, 98bis Blvd Arago, F-75014 Paris, France
4.Yunnan Univ, South Western Inst Astron Res SWIFAR, Kunming 650091, Yunnan, Peoples R China
5.Nordic Opt Telescope NOT, Apartado 474, Santa Cruz De La Palma 38700, Spain
6.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China
Recommended Citation
GB/T 7714
Huo, Z.,Dennefeld, M.,Liu, X.,et al. Characterizing some Gaia Alerts with LAMOST and SDSS[J]. ASTROPHYSICS AND SPACE SCIENCE,2020,365(5):18.
APA Huo, Z.,Dennefeld, M.,Liu, X.,Pursimo, T.,&Zhang, T..(2020).Characterizing some Gaia Alerts with LAMOST and SDSS.ASTROPHYSICS AND SPACE SCIENCE,365(5),18.
MLA Huo, Z.,et al."Characterizing some Gaia Alerts with LAMOST and SDSS".ASTROPHYSICS AND SPACE SCIENCE 365.5(2020):18.
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