Protoplanetary discs of young VLMOs discovered in the IPHAS survey

Details Protoplanetary discs of young VLMOs discovered in the IPHAS survey Protoplanetary discs of young VLMOs discovered in the IPHAS survey

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..513v&link_type=abstract

Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held

Astronomy and Astrophysics

Astrophysics

Scientific paper

In a previous study, Virtual Observatory tools were used to cross-match the IPHAS catalogue with the 2MASS catalogue for searching young very low-mass objects. We defined photometric criteria to identify Halpha emission sources with near-infrared colors similar to known young very low-mass stars and brown dwarfs. Spectral types have been derived for the 33 candidates that have spectroscopically confirmed Halpha emission and spectral class M. Many objects also have weak NaI doublet, an indication of low surface gravity. Here we focus on a deeper study of the targets. We found that many of them display a clear excess in the Spitzer bandpasses, commonly associated with the presence of circumstellar material. Together with their strong Halpha emission, which must be associated to accretion, the mid-infrared excesses confirm the youth of these objects.

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