Abstract
We present the discovery of a candidate substellar object in a survey of young stars in the solar vicinity using the sensitivity and spatial resolution afforded by the NICMOS coronagraph on the Hubble Space Telescope. The H = 12.1 mag object was discovered approximately 2″ from the TW Hydrae association member CD -33°7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of ∼2600 K. We estimate that the probability of a chance alignment with a background object of this nature is less than 2 × 10-5 and therefore postulate that the object (TWA 5B) is physically associated at a projected separation of 100 AU. Given the likely youth of the primary (∼10 Myr), current brown dwarf cooling models predict a mass of ≈20MJup for TWA 5B.
| Original language | English (US) |
|---|---|
| Journal | Astrophysical Journal |
| Volume | 512 |
| Issue number | 1 PART 2 |
| State | Published - Feb 10 1999 |
| Externally published | Yes |
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Keywords
- Stars: Low-mass, brown dwarfs
ASJC Scopus subject areas
- Space and Planetary Science
Cite this
A candidate substellar companion to CD -33°7795 (TWA 5). / Lowrance, Patrick J.; McCarthy, Chris; Becklin, E. E.; Zuckerman, B.; Schneider, Glenn; Webb, R. A.; Hines, Dean C.; Kirkpatrick, J. Davy; Koerner, David W; Low, Frank; Meier, Roland; Rieke, Marcia; Smith, Bradford A.; Terrile, Richard J.; Thompson, Rodger I.
In: Astrophysical Journal, Vol. 512, No. 1 PART 2, 10.02.1999.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A candidate substellar companion to CD -33°7795 (TWA 5)
AU - Lowrance, Patrick J.
AU - McCarthy, Chris
AU - Becklin, E. E.
AU - Zuckerman, B.
AU - Schneider, Glenn
AU - Webb, R. A.
AU - Hines, Dean C.
AU - Kirkpatrick, J. Davy
AU - Koerner, David W
AU - Low, Frank
AU - Meier, Roland
AU - Rieke, Marcia
AU - Smith, Bradford A.
AU - Terrile, Richard J.
AU - Thompson, Rodger I.
PY - 1999/2/10
Y1 - 1999/2/10
N2 - We present the discovery of a candidate substellar object in a survey of young stars in the solar vicinity using the sensitivity and spatial resolution afforded by the NICMOS coronagraph on the Hubble Space Telescope. The H = 12.1 mag object was discovered approximately 2″ from the TW Hydrae association member CD -33°7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of ∼2600 K. We estimate that the probability of a chance alignment with a background object of this nature is less than 2 × 10-5 and therefore postulate that the object (TWA 5B) is physically associated at a projected separation of 100 AU. Given the likely youth of the primary (∼10 Myr), current brown dwarf cooling models predict a mass of ≈20MJup for TWA 5B.
AB - We present the discovery of a candidate substellar object in a survey of young stars in the solar vicinity using the sensitivity and spatial resolution afforded by the NICMOS coronagraph on the Hubble Space Telescope. The H = 12.1 mag object was discovered approximately 2″ from the TW Hydrae association member CD -33°7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of ∼2600 K. We estimate that the probability of a chance alignment with a background object of this nature is less than 2 × 10-5 and therefore postulate that the object (TWA 5B) is physically associated at a projected separation of 100 AU. Given the likely youth of the primary (∼10 Myr), current brown dwarf cooling models predict a mass of ≈20MJup for TWA 5B.
KW - Stars: Low-mass, brown dwarfs
UR - http://www.scopus.com/inward/record.url?scp=17544395897&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=17544395897&partnerID=8YFLogxK
M3 - Article
VL - 512
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1 PART 2
ER -