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A search for variab...
A search for variability in exoplanet analogues and low-gravity brown dwarfs
- Article/chapterEnglish2019
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2018-11-22
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Oxford University Press (OUP),2019
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LIBRIS-ID:oai:DiVA.org:su-168452
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-168452URI
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https://doi.org/10.1093/mnras/sty3123DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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We report the results of a J-band survey for photometric variability in a sample of young, low-gravity objects using the New Technology Telescope (NTT) and the United Kingdom Infrared Telescope (UKIRT). Surface gravity is a key parameter in the atmospheric properties of brown dwarfs and this is the first large survey that aims to test the gravity dependence of variability properties. We do a full analysis of the spectral signatures of youth and assess the group membership probability of each target using membership tools from the literature. This results in a 30 object sample of young low-gravity brown dwarfs. Since we are lacking in objects with spectral types later than L9, we focus our statistical analysis on the L0-L8.5 objects. We find that the variability occurrence rate of L0-L8.5 low-gravity brown dwarfs in this survey is 30(-8)(+16) per cent. We reanalyse the results of Radigan (2014) and find that the field dwarfs with spectral types L0-L8.5 have a variability occurrence rate of 11(-4)(+13) per cent. We determine a probability of 98 per cent that the samples are drawn from different distributions. This is the first quantitative indication that the low-gravity objects are more likely to be variable than the field dwarf population. Furthermore, we present follow-up J(S) and K-S observations of the young, planetary-mass variable object PSO 318.5-22 over three consecutive nights. We find no evidence of phase shifts between the J(S) and K-S bands and find higher J(S) amplitudes. We use the J(S) light curves to measure a rotational period of 8.45 +/- 0.05 h for PSO 318.5-22.
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Biller, Beth A.
(author)
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Bonavita, Mariangela
(author)
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Eriksson, SimonStockholms universitet,Institutionen för astronomi(Swepub:su)sier8496
(author)
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Liu, Michael C.
(author)
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Best, William M. J.
(author)
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Metchev, Stanimir
(author)
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Radigan, Jacqueline
(author)
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Allers, Katelyn N.
(author)
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Janson, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mjanso
(author)
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Buenzli, Esther
(author)
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Dupuy, Trent J.
(author)
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Bonnefoy, Mickael
(author)
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Manjavacas, Elena
(author)
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Brandner, Wolfgang
(author)
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Crossfield, Ian
(author)
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Deacon, Niall
(author)
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Henning, Thomas
(author)
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Homeier, Derek
(author)
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Kopytova, Taisiya
(author)
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Schlieder, Joshua
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)483:1, s. 480-5020035-87111365-2966
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Vos, Johanna M.
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Biller, Beth A.
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Bonavita, Marian ...
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Eriksson, Simon
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Liu, Michael C.
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Best, William M. ...
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Metchev, Stanimi ...
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Radigan, Jacquel ...
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Allers, Katelyn ...
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Janson, Markus
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Buenzli, Esther
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Dupuy, Trent J.
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Bonnefoy, Mickae ...
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Manjavacas, Elen ...
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Brandner, Wolfga ...
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Crossfield, Ian
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Deacon, Niall
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Henning, Thomas
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Homeier, Derek
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Kopytova, Taisiy ...
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Schlieder, Joshu ...
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Stockholm University