A Survey for Planetary-mass Brown Dwarfs in the Taurus and Perseus Star-forming Regions

T. L. Esplin, Kevin Luhman

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We present the initial results from a survey for planetary-mass brown dwarfs in the Taurus star-forming region. We have identified brown dwarf candidates in Taurus using proper motions and photometry from several ground- and space-based facilities. Through spectroscopy of some of the more promising candidates, we have found 18 new members of Taurus. They have spectral types ranging from mid-M to early-L, and they include the four faintest known members in extinction-corrected K s, which should have masses as low as ∼4-5 M Jup according to evolutionary models. Two of the coolest new members (M9.25, M9.5) have mid-IR excesses that indicate the presence of disks. Two fainter objects with types of M9-L2 and M9-L3 also have red mid-IR colors relative to photospheres at ≤L0, but since the photospheric colors are poorly defined at >L0, it is unclear whether they have excesses from disks. We also have obtained spectra of candidate members of the IC 348 and NGC 1333 clusters in Perseus that were identified by Luhman et al. Eight candidates are found to be probable members, three of which are among the faintest and least-massive known members of the clusters (∼5 M Jup).

Original languageEnglish (US)
Article number134
JournalAstronomical Journal
Volume154
Issue number4
DOIs
StatePublished - Oct 1 2017

Fingerprint

planetary mass
color
faint objects
stars
proper motion
photosphere
photometry
extinction
spectroscopy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

@article{e058597f1f534ae5875cda74a9f434e5,
title = "A Survey for Planetary-mass Brown Dwarfs in the Taurus and Perseus Star-forming Regions",
abstract = "We present the initial results from a survey for planetary-mass brown dwarfs in the Taurus star-forming region. We have identified brown dwarf candidates in Taurus using proper motions and photometry from several ground- and space-based facilities. Through spectroscopy of some of the more promising candidates, we have found 18 new members of Taurus. They have spectral types ranging from mid-M to early-L, and they include the four faintest known members in extinction-corrected K s, which should have masses as low as ∼4-5 M Jup according to evolutionary models. Two of the coolest new members (M9.25, M9.5) have mid-IR excesses that indicate the presence of disks. Two fainter objects with types of M9-L2 and M9-L3 also have red mid-IR colors relative to photospheres at ≤L0, but since the photospheric colors are poorly defined at >L0, it is unclear whether they have excesses from disks. We also have obtained spectra of candidate members of the IC 348 and NGC 1333 clusters in Perseus that were identified by Luhman et al. Eight candidates are found to be probable members, three of which are among the faintest and least-massive known members of the clusters (∼5 M Jup).",
author = "Esplin, {T. L.} and Kevin Luhman",
year = "2017",
month = "10",
day = "1",
doi = "10.3847/1538-3881/aa859b",
language = "English (US)",
volume = "154",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "4",

}

A Survey for Planetary-mass Brown Dwarfs in the Taurus and Perseus Star-forming Regions. / Esplin, T. L.; Luhman, Kevin.

In: Astronomical Journal, Vol. 154, No. 4, 134, 01.10.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A Survey for Planetary-mass Brown Dwarfs in the Taurus and Perseus Star-forming Regions

AU - Esplin, T. L.

AU - Luhman, Kevin

PY - 2017/10/1

Y1 - 2017/10/1

N2 - We present the initial results from a survey for planetary-mass brown dwarfs in the Taurus star-forming region. We have identified brown dwarf candidates in Taurus using proper motions and photometry from several ground- and space-based facilities. Through spectroscopy of some of the more promising candidates, we have found 18 new members of Taurus. They have spectral types ranging from mid-M to early-L, and they include the four faintest known members in extinction-corrected K s, which should have masses as low as ∼4-5 M Jup according to evolutionary models. Two of the coolest new members (M9.25, M9.5) have mid-IR excesses that indicate the presence of disks. Two fainter objects with types of M9-L2 and M9-L3 also have red mid-IR colors relative to photospheres at ≤L0, but since the photospheric colors are poorly defined at >L0, it is unclear whether they have excesses from disks. We also have obtained spectra of candidate members of the IC 348 and NGC 1333 clusters in Perseus that were identified by Luhman et al. Eight candidates are found to be probable members, three of which are among the faintest and least-massive known members of the clusters (∼5 M Jup).

AB - We present the initial results from a survey for planetary-mass brown dwarfs in the Taurus star-forming region. We have identified brown dwarf candidates in Taurus using proper motions and photometry from several ground- and space-based facilities. Through spectroscopy of some of the more promising candidates, we have found 18 new members of Taurus. They have spectral types ranging from mid-M to early-L, and they include the four faintest known members in extinction-corrected K s, which should have masses as low as ∼4-5 M Jup according to evolutionary models. Two of the coolest new members (M9.25, M9.5) have mid-IR excesses that indicate the presence of disks. Two fainter objects with types of M9-L2 and M9-L3 also have red mid-IR colors relative to photospheres at ≤L0, but since the photospheric colors are poorly defined at >L0, it is unclear whether they have excesses from disks. We also have obtained spectra of candidate members of the IC 348 and NGC 1333 clusters in Perseus that were identified by Luhman et al. Eight candidates are found to be probable members, three of which are among the faintest and least-massive known members of the clusters (∼5 M Jup).

UR - http://www.scopus.com/inward/record.url?scp=85031129464&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85031129464&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aa859b

DO - 10.3847/1538-3881/aa859b

M3 - Article

AN - SCOPUS:85031129464

VL - 154

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 4

M1 - 134

ER -