Detection of brown dwarf like objects in the core of NGC3603

Loredana Spezzi, Giacomo Beccari, Guido De Marchi, Erick T. Young, Francesco Paresce, Michael A. Dopita, Morten Andersen, Nino Panagia, Bruce Balick, Howard E. Bond, Daniela Calzetti, C. Marcella Carollo, Michael J. Disney, Jay A. Frogel, Donald N B Hall, Jon A. Holtzman, Randy A. Kimble, Patrick J. McCarthy, Robert W. O'Connell, Russell E. Ryan & 6 others Abhijit Saha, Joseph I. Silk, John T. Trauger, Alistair R. Walker, Bradley C. Whitmore, Rogier Windhorst

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We used near-infrared data obtained with the Wide Field Camera 3 on the Hubble Space Telescope to identify objects having the colors of brown dwarfs (BDs) in the field of the massive galactic cluster NGC3603. These are identified through a combination of narrow- and medium-band filters which span the J and H bands and are particularly sensitive to the presence of the 1.3-1.5 μm H2O molecular band unique to BDs. We provide a calibration of the relationship between effective temperature and color for both field stars and BDs. This photometric method provides effective temperatures for BDs to an accuracy of 350 ± K relative to spectroscopic techniques. This accuracy is shown to be not significantly affected by either stellar surface gravity or uncertainties in the interstellar extinction. We identify nine objects having effective temperatures between 1700 and 2200 K, typical of BDs, observed J-band magnitudes in the range 19.5-21.5, and that are strongly clustered toward the luminous core of NGC3603. However, if these are located at the distance of the cluster, they are far too luminous to be normal BDs. We argue that it is unlikely that these objects are either artifacts of our data set, normal field BDs/M-type giants, or extragalactic contaminants and, therefore, might represent a new class of stars having the effective temperatures of BDs but with luminosities of more massive stars. We explore the interesting scenario in which these objects would be normal stars that have recently tidally ingested a hot Jupiter, the remnants of which are providing a short-lived extended photosphere to the central star. In this case, we would expect them to show the signature of fast rotation.

Original languageEnglish (US)
Article number1
JournalAstrophysical Journal
Volume731
Issue number1
DOIs
StatePublished - Apr 10 2011

Fingerprint

stars
temperature
color
interstellar extinction
galactic clusters
star distribution
photosphere
Jupiter (planet)
massive stars
Hubble Space Telescope
Jupiter
contaminants
artifact
artifacts
near infrared
extinction
cameras
luminosity
signatures
gravity

Keywords

  • brown dwarfs
  • instrumentation: photometers
  • open clusters and associations: individual (NCG 3603)
  • stars: pre-main sequence
  • techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Spezzi, L., Beccari, G., De Marchi, G., Young, E. T., Paresce, F., Dopita, M. A., ... Windhorst, R. (2011). Detection of brown dwarf like objects in the core of NGC3603. Astrophysical Journal, 731(1), [1]. https://doi.org/10.1088/0004-637X/731/1/1

Detection of brown dwarf like objects in the core of NGC3603. / Spezzi, Loredana; Beccari, Giacomo; De Marchi, Guido; Young, Erick T.; Paresce, Francesco; Dopita, Michael A.; Andersen, Morten; Panagia, Nino; Balick, Bruce; Bond, Howard E.; Calzetti, Daniela; Carollo, C. Marcella; Disney, Michael J.; Frogel, Jay A.; Hall, Donald N B; Holtzman, Jon A.; Kimble, Randy A.; McCarthy, Patrick J.; O'Connell, Robert W.; Ryan, Russell E.; Saha, Abhijit; Silk, Joseph I.; Trauger, John T.; Walker, Alistair R.; Whitmore, Bradley C.; Windhorst, Rogier.

In: Astrophysical Journal, Vol. 731, No. 1, 1, 10.04.2011.

Research output: Contribution to journalArticle

Spezzi, L, Beccari, G, De Marchi, G, Young, ET, Paresce, F, Dopita, MA, Andersen, M, Panagia, N, Balick, B, Bond, HE, Calzetti, D, Carollo, CM, Disney, MJ, Frogel, JA, Hall, DNB, Holtzman, JA, Kimble, RA, McCarthy, PJ, O'Connell, RW, Ryan, RE, Saha, A, Silk, JI, Trauger, JT, Walker, AR, Whitmore, BC & Windhorst, R 2011, 'Detection of brown dwarf like objects in the core of NGC3603', Astrophysical Journal, vol. 731, no. 1, 1. https://doi.org/10.1088/0004-637X/731/1/1
Spezzi L, Beccari G, De Marchi G, Young ET, Paresce F, Dopita MA et al. Detection of brown dwarf like objects in the core of NGC3603. Astrophysical Journal. 2011 Apr 10;731(1). 1. https://doi.org/10.1088/0004-637X/731/1/1
Spezzi, Loredana ; Beccari, Giacomo ; De Marchi, Guido ; Young, Erick T. ; Paresce, Francesco ; Dopita, Michael A. ; Andersen, Morten ; Panagia, Nino ; Balick, Bruce ; Bond, Howard E. ; Calzetti, Daniela ; Carollo, C. Marcella ; Disney, Michael J. ; Frogel, Jay A. ; Hall, Donald N B ; Holtzman, Jon A. ; Kimble, Randy A. ; McCarthy, Patrick J. ; O'Connell, Robert W. ; Ryan, Russell E. ; Saha, Abhijit ; Silk, Joseph I. ; Trauger, John T. ; Walker, Alistair R. ; Whitmore, Bradley C. ; Windhorst, Rogier. / Detection of brown dwarf like objects in the core of NGC3603. In: Astrophysical Journal. 2011 ; Vol. 731, No. 1.
@article{f22ece6e8134448480db4ac2cdc8260d,
title = "Detection of brown dwarf like objects in the core of NGC3603",
abstract = "We used near-infrared data obtained with the Wide Field Camera 3 on the Hubble Space Telescope to identify objects having the colors of brown dwarfs (BDs) in the field of the massive galactic cluster NGC3603. These are identified through a combination of narrow- and medium-band filters which span the J and H bands and are particularly sensitive to the presence of the 1.3-1.5 μm H2O molecular band unique to BDs. We provide a calibration of the relationship between effective temperature and color for both field stars and BDs. This photometric method provides effective temperatures for BDs to an accuracy of 350 ± K relative to spectroscopic techniques. This accuracy is shown to be not significantly affected by either stellar surface gravity or uncertainties in the interstellar extinction. We identify nine objects having effective temperatures between 1700 and 2200 K, typical of BDs, observed J-band magnitudes in the range 19.5-21.5, and that are strongly clustered toward the luminous core of NGC3603. However, if these are located at the distance of the cluster, they are far too luminous to be normal BDs. We argue that it is unlikely that these objects are either artifacts of our data set, normal field BDs/M-type giants, or extragalactic contaminants and, therefore, might represent a new class of stars having the effective temperatures of BDs but with luminosities of more massive stars. We explore the interesting scenario in which these objects would be normal stars that have recently tidally ingested a hot Jupiter, the remnants of which are providing a short-lived extended photosphere to the central star. In this case, we would expect them to show the signature of fast rotation.",
keywords = "brown dwarfs, instrumentation: photometers, open clusters and associations: individual (NCG 3603), stars: pre-main sequence, techniques: photometric",
author = "Loredana Spezzi and Giacomo Beccari and {De Marchi}, Guido and Young, {Erick T.} and Francesco Paresce and Dopita, {Michael A.} and Morten Andersen and Nino Panagia and Bruce Balick and Bond, {Howard E.} and Daniela Calzetti and Carollo, {C. Marcella} and Disney, {Michael J.} and Frogel, {Jay A.} and Hall, {Donald N B} and Holtzman, {Jon A.} and Kimble, {Randy A.} and McCarthy, {Patrick J.} and O'Connell, {Robert W.} and Ryan, {Russell E.} and Abhijit Saha and Silk, {Joseph I.} and Trauger, {John T.} and Walker, {Alistair R.} and Whitmore, {Bradley C.} and Rogier Windhorst",
year = "2011",
month = "4",
day = "10",
doi = "10.1088/0004-637X/731/1/1",
language = "English (US)",
volume = "731",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Detection of brown dwarf like objects in the core of NGC3603

AU - Spezzi, Loredana

AU - Beccari, Giacomo

AU - De Marchi, Guido

AU - Young, Erick T.

AU - Paresce, Francesco

AU - Dopita, Michael A.

AU - Andersen, Morten

AU - Panagia, Nino

AU - Balick, Bruce

AU - Bond, Howard E.

AU - Calzetti, Daniela

AU - Carollo, C. Marcella

AU - Disney, Michael J.

AU - Frogel, Jay A.

AU - Hall, Donald N B

AU - Holtzman, Jon A.

AU - Kimble, Randy A.

AU - McCarthy, Patrick J.

AU - O'Connell, Robert W.

AU - Ryan, Russell E.

AU - Saha, Abhijit

AU - Silk, Joseph I.

AU - Trauger, John T.

AU - Walker, Alistair R.

AU - Whitmore, Bradley C.

AU - Windhorst, Rogier

PY - 2011/4/10

Y1 - 2011/4/10

N2 - We used near-infrared data obtained with the Wide Field Camera 3 on the Hubble Space Telescope to identify objects having the colors of brown dwarfs (BDs) in the field of the massive galactic cluster NGC3603. These are identified through a combination of narrow- and medium-band filters which span the J and H bands and are particularly sensitive to the presence of the 1.3-1.5 μm H2O molecular band unique to BDs. We provide a calibration of the relationship between effective temperature and color for both field stars and BDs. This photometric method provides effective temperatures for BDs to an accuracy of 350 ± K relative to spectroscopic techniques. This accuracy is shown to be not significantly affected by either stellar surface gravity or uncertainties in the interstellar extinction. We identify nine objects having effective temperatures between 1700 and 2200 K, typical of BDs, observed J-band magnitudes in the range 19.5-21.5, and that are strongly clustered toward the luminous core of NGC3603. However, if these are located at the distance of the cluster, they are far too luminous to be normal BDs. We argue that it is unlikely that these objects are either artifacts of our data set, normal field BDs/M-type giants, or extragalactic contaminants and, therefore, might represent a new class of stars having the effective temperatures of BDs but with luminosities of more massive stars. We explore the interesting scenario in which these objects would be normal stars that have recently tidally ingested a hot Jupiter, the remnants of which are providing a short-lived extended photosphere to the central star. In this case, we would expect them to show the signature of fast rotation.

AB - We used near-infrared data obtained with the Wide Field Camera 3 on the Hubble Space Telescope to identify objects having the colors of brown dwarfs (BDs) in the field of the massive galactic cluster NGC3603. These are identified through a combination of narrow- and medium-band filters which span the J and H bands and are particularly sensitive to the presence of the 1.3-1.5 μm H2O molecular band unique to BDs. We provide a calibration of the relationship between effective temperature and color for both field stars and BDs. This photometric method provides effective temperatures for BDs to an accuracy of 350 ± K relative to spectroscopic techniques. This accuracy is shown to be not significantly affected by either stellar surface gravity or uncertainties in the interstellar extinction. We identify nine objects having effective temperatures between 1700 and 2200 K, typical of BDs, observed J-band magnitudes in the range 19.5-21.5, and that are strongly clustered toward the luminous core of NGC3603. However, if these are located at the distance of the cluster, they are far too luminous to be normal BDs. We argue that it is unlikely that these objects are either artifacts of our data set, normal field BDs/M-type giants, or extragalactic contaminants and, therefore, might represent a new class of stars having the effective temperatures of BDs but with luminosities of more massive stars. We explore the interesting scenario in which these objects would be normal stars that have recently tidally ingested a hot Jupiter, the remnants of which are providing a short-lived extended photosphere to the central star. In this case, we would expect them to show the signature of fast rotation.

KW - brown dwarfs

KW - instrumentation: photometers

KW - open clusters and associations: individual (NCG 3603)

KW - stars: pre-main sequence

KW - techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=79955035359&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79955035359&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/731/1/1

DO - 10.1088/0004-637X/731/1/1

M3 - Article

VL - 731

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 1

ER -