Thompson, M. A. and Vieiria, J. (2010) A search for debris disks in the Herschel-ATLAS. Astronomy and Astrophysics, 518 . Art. No. L134. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20101129-152249770
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Aims. We aim to demonstrate that the Herschel-ATLAS (H-ATLAS) is suitable for a blind and unbiased survey for debris disks by identifying candidate debris disks associated with main sequence stars in the initial science demonstration field of the survey. We show that H-ATLAS reveals a population of far-infrared/sub-mm sources that are associated with stars or star-like objects on the SDSS main-sequence locus. We validate our approach by comparing the properties of the most likely candidate disks to those of the known population. Methods. We use a photometric selection technique to identify main sequence stars in the SDSS DR7 catalogue and a Bayesian Likelihood Ratio method to identify H-ATLAS catalogue sources associated with these main sequence stars. Following this photometric selection we apply distance cuts to identify the most likely candidate debris disks and rule out the presence of contaminating galaxies using UKIDSS LAS K-band images. Results. We identify 78 H-ATLAS sources associated with SDSS point sources on the main-sequence locus, of which two are the most likely debris disk candidates: H-ATLAS J090315.8 and H-ATLAS J090240.2. We show that they are plausible candidates by comparing their properties to the known population of debris disks. Our initial results indicate that bright debris disks are rare, with only 2 candidates identified in a search sample of 851 stars. We also show that H-ATLAS can derive useful upper limits for debris disks associated with Hipparcos stars in the field and outline the future prospects for our debris disk search programme.
|Additional Information:||© 2010 ESO. Received 31 March 2010, Accepted 12 May 2010, Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The UKIDSS project is defined in Lawrence et al. (2007). UKIDSS uses the UKIRT Wide Field Camera (WFCAM; Casali et al. 2007). The photometric system is described in Hambly et al. (2008), and the calibration is described in Hodgkin et al. (2009). The pipeline processing and science archive are described in Hambly et al. (2008). M.A.T. would like to thank two of our undergraduate project students, Sam Richards and Max Podger, who carried out initial database searches and also David Pinfield and Ralf Napiwotski for discussions on low mass stars.|
|Subject Keywords:||circumstellar matter, submillimeter: stars, submillimeter: planetary systems|
|Official Citation:||A search for debris disks in the Herschel-ATLAS M. A. Thompson, D. J. B. Smith, J. A. Stevens, M. J. Jarvis, E. Vidal Perez, J. Marshall, L. Dunne, S. Eales, G. J. White, L. Leeuw, B. Sibthorpe, M. Baes, E. González-Solares, D. Scott, J. Vieiria, A. Amblard, R. Auld, D. G. Bonfield, D. Burgarella, S. Buttiglione, A. Cava, D. L. Clements, A. Cooray, A. Dariush, G. de Zotti, S. Dye, S. Eales, D. Frayer, J. Fritz, J. Gonzalez-Nuevo, D. Herranz, E. Ibar, R. J. Ivison, G. Lagache, M. Lopez-Caniego, S. Maddox, M. Negrello, E. Pascale, M. Pohlen, E. Rigby, G. Rodighiero, S. Samui, S. Serjeant, P. Temi, I. Valtchanov and A. Verma A&A 518 L134 (2010) DOI: 10.1051/0004-6361/201014639|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||30 Nov 2010 16:48|
|Last Modified:||26 Dec 2012 12:41|
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