|Dust and gas in brown dwarf disks: A multi-wavelength survey with Herschel
|Disks around young brown dwarfs are a valuable test regime for our current understanding of star and planet formation. The disk sizes and masses are key indicators to assess the significance of dynamical encounters for the formation of very low mass objects. The disk mass, together with the properties of the dust, also constrains the potential for planet formation around brown dwarfs, which can be used to evaluate the diversity and ubiquity of planetary systems. To tackle these science goals, we need constraints on the global characteristics of brown dwarf disks. This requires multi-wavelength observations of the far-infrared-submm continuum to trace the distribution and properties of the dust in the disk, as well as line spectroscopy to probe for the presence and amount of gas in the disk. Herschel is uniquely suited for such a project. Here we propose to observe a well-characterised and carefully selected sample of 16 brown dwarfs with PACS and SPIRE photometry, complemented by PACS line spectroscopy for the 3 brightest objects. We expect to provide the first robust assessments of the masses and sizes of disks in the substellar regime. For the first time, we will be able to probe the dust opacity and the amount of gas in the brown dwarf regime, crucial parameters for the understanding of the disk physics. These observations will gain further value in synergy with planned submm interferometry campaigns with SMA and ALMA in the next year. Our project constitutes a significant step towards a solid characterisation of brown dwarf disks.
|The (w)hole survey: An unbiased sample study of transition disk candidates based on Spitzer catalogs . van der Marel N. et al. . Astronomy & Astrophysics, Volume 592, id.A126, 36 pp. . 592 . 10.1051/0004-6361/201628075 . 2016A&A...592A.126V ,
Brown dwarf disks with Herschel: Linking far-infrared and (sub)-mm fluxes . Daemgen Sebastian et al. . Astronomy & Astrophysics, Volume 594, id.A83, 16 pp. . 594 . 10.1051/0004-6361/201628431 . 2016A&A...594A..83D ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, OT1_ascholz_1, SPG v14.2.0. https://doi.org/10.5270/esa-5exxg0j