The BASS Survey

The BASS Survey


The BANYAN All-Sky Survey (BASS, pronounced like the musical instrument, not the fish) is a systematic survey based on 2MASS and AllWISE that aims at identifying new brown dwarfs and low-mass stars (spectral types > M4) in young moving groups of the solar neighborhood (approx. within 100 pc). Here is a list of papers that arose from the BASS survey:

  1. Gagné et al. 2015a: In this paper, we described the selection criteria and the list of all candidate members that were generated from the BASS survey. Follow this link for data related to this paper.
  2. Delorme et al. 2013: A direct-imaging survey for close-in companions to BASS targets with the NACO imager was initiated in collaboration with researchers at IPAG at the early stages of the survey. 2MASS J0103-5515 was found to be a tight binary with a companion near the deuterium-burning mass limit on a 84 AU orbit.
  3. Gagné et al. 2014b: This paper reports the discovery of 2MASS J1207-3900, the coolest (L-type) planetary-mass candidate member of the TW Hya association at the time. The record for the coolest candidate members of TW Hya has been beaten twice since (see Kellogg et al. 2016 and Schneider et al. 2016). Follow this link for data related to this paper. The spectrum of this target can be found here.
  4. Artigau et al. 2016: This paper reports the discovery of a young companion around 2MASS J0219-3925 that spans the deuterium-burning mass limit, resulting from a direct-imaging search for wide companions to BASS candidates. The primary low-mass star was identified as a candidate member of Tucana-Horologium in the BASS survey, but Kraus et al. (2014) also identified it independently, and were the first to report it as such. The spectrum of this companion can be found here.
  5. Gagné et al. 2015c: This paper presents a near-infrared spectroscopic follow-up of 182 M4 to L7-type candidates from the BASS survey. This paper added 66 objects to the previous census of young brown dwarfs, as well as several new young low-mass stars. An unexpected  amount of young brown dwarfs near the deuterium-burning mass limit were found as candidate members of Tucana-Horologium. Follow this link for data related to this paper. All spectra can also be found here.
  6. Boucher et al. 2016 (coming soon): This paper investigated BASS targets and other known young objects for infrared excesses indicative of circumstellar disks. They identified four new circumstellar disk candidates around BASS targets with spectral types M4 to L0.


A new survey called BASS-Ultracool has recently been initiated to identify the > L5-type, planetary-mass members of nearby young moving groups. More information on this survey will be posted on this website soon. In the meantime, you can see the following resources to learn more about it:

  1. The research proposal of the BASS-Ultracool survey is available here.
  2. A paper describing the first discovery from BASS-Ultracool is available here. This target is a T5-type bona fide member of AB Doradus with a mass of 11 times that of Jupiter.
  3. A poster describing the BASS-Ultracool survey is available here.

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