A Possible Third Component in the L Dwarf Binary System DENIS-P J020529.0-115925 Discovered with the<i>Hubble Space Telescope</i>

Bouy, H.; Martín, E. L.; Brandner, W.; Bouvier, J.

doi:10.1086/426559

Cited by 44 publications

(43 citation statements)

References 21 publications

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“…Thus, 2MASSW J1146344+223052 may be a triple system. Very low-mass triple systems may not be rare as indicated by the recent observations of GJ 900 (Martín 2003) and DENIS-P J020529.0-115925 (Bouy et al 2005). Confirmation of the suspected unresolved binarity of 2MASSW J1146344+223052 A requires high angular resolution observations or radial velocity monitoring.…”

Section: Description Of the Spectra Of Each Binarymentioning

confidence: 99%

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Resolved Hubble space spectroscopy of ultracool binary systems

Martín

Brandner

Bouy³

et al. 2006

A&A

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Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of which belong to nine very low-mass binary systems with known angular separations in the range 0. 37-0. 098. For these dwarfs, we derive their spectral types to be in the range dM7.5 to dL6 by either obtaining their PC3 index value or by comparing our STIS spectra with ground-based spectra of similar spectral resolution from Martín et al. (1999b). We have searched for H α emission in each object, but the emission is clearly detected in only two of them. We find that the distribution of H α emission in our sample is statistically different from that of single field dwarfs, suggesting an intriguing anti-correlation between chromospheric activity and binarity for M7-M9.5 dwarfs. We provide strength measuments of the main photospheric features. We derive calibrations of spectral subclasses versus F814W and K-band absolute magnitudes for a subset of 10 dwarfs in 5 binaries that have known trigonometric parallaxes.

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Section: Description Of the Spectra Of Each Binarymentioning

confidence: 99%

“…16, we plot . 2 DENIS-P J0205-1159 B is itself likely double (Bouy et al 2005). Our STIS spectrum and the Ks magnitude of Koerner et al (1999) include the sum of the two components.…”

Section: Absolute Magnitude Versus Spectral Type Relationshipsmentioning

confidence: 99%

Resolved Hubble space spectroscopy of ultracool binary systems

Martín

Brandner

Bouy³

et al. 2006

A&A

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“…2MASS J0700+3157 and 2MASS J0920+3517 bring the tally of high-order multiples composed entirely of likely brown dwarfs to five, and these are the first such triple systems with directly measured masses, semimajor axes, and eccentricities. The first triple brown dwarf identified was DENIS J020529.0−115925 (Bouy et al 2005), where the primary (L5) is orbited by a L/T transition binary (L8+T0). Radigan et al (2013) discovered the triple T dwarf system 2MASS J08381155+1511155, where the brightest component (T3) is orbited by two slightly fainter components (T3+T4.5).…”

Section: Discovery Of Triple Systemsmentioning

confidence: 99%

Individual Dynamical Masses of Ultracool Dwarfs* ^† ^‡

Dupuy

Liu

2017

ApJS

180

216

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We present the full results of our decade-long astrometric monitoring programs targeting 31 ultracool binaries with component spectral types M7-T5. Joint analysis of resolved imaging from Keck Observatory and Hubble Space Telescope and unresolved astrometry from CFHT/WIRCam yields parallactic distances for all systems, robust orbit determinations for 23 systems, and photocenter orbits for 19 systems. As a result, we measure 38 precise individual masses spanning 30-115 M Jup . We determine a modelindependent substellar boundary that is ≈70 M Jup in mass (≈L4 in spectral type), and we validate Baraffe et al. (2015) evolutionary model predictions for the lithium-depletion boundary (60 M Jup at field ages). Assuming each binary is coeval, we test models of the substellar mass-luminosity relation and that find in the L/T transition, only the Saumon & Marley (2008) "hybrid" models accounting for cloud clearing match our data. We derive a precise, mass-calibrated spectral type-effective temperature relation covering 1100-2800 K. Our masses enable a novel direct determination of the age distribution of field brown dwarfs spanning L4-T5 and 30-70 M Jup . We determine a median age of 1.3 Gyr, and our population synthesis modeling indicates our sample is consistent with a constant star formation history modulated by dynamical heating in the Galactic disk. We discover two triple-brown-dwarf systems, the first with directly measured masses and eccentricities. We examine the eccentricity distribution, carefully considering biases and completeness, and find that low-eccentricity orbits are significantly more common among ultracool binaries than solar-type binaries, possibly indicating the early influence of long-lived dissipative gas disks. Overall, this work represents a major advance in the empirical view of very low-mass stars and brown dwarfs.

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“…Three of these systems have total estimated masses M tot 0.15 M , although their tertiary components have not been solidly confirmed. DENIS-P J020529.0-115925ABC (hereafter DENIS J0205-1159AB(C); Delfosse et al 1997;Koerner et al 1999;Bouy et al 2005) was resolved into a ∼7 AU binary by AO and HST imaging. Evidence for a third component was reported by Bouy et al (2005), but only on the basis of persistent residuals in pointspread function fitting of the resolved pair in multi-epoch HST images.…”

Section: Very Low Mass Triplesmentioning

confidence: 99%

“…DENIS-P J020529.0-115925ABC (hereafter DENIS J0205-1159AB(C); Delfosse et al 1997;Koerner et al 1999;Bouy et al 2005) was resolved into a ∼7 AU binary by AO and HST imaging. Evidence for a third component was reported by Bouy et al (2005), but only on the basis of persistent residuals in pointspread function fitting of the resolved pair in multi-epoch HST images. 2MASS J08503593+1057156ABC (hereafter 2MASS J0850+1057AB(C); Kirkpatrick et al 1999;Reid et al 2001) was resolved as a 0.…”

Section: Very Low Mass Triplesmentioning

confidence: 99%

Discovery of a Very Low Mass Triple With Late-M and T Dwarf Components: Lp 704-48/SDSS J0006–0852ab

Burgasser

Luk

Dhital

et al. 2012

ApJ

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We report the identification of the M9 dwarf SDSS J000649.16−085246.3 as a spectral binary and radial velocity (RV) variable with components straddling the hydrogen-burning mass limit. Low-resolution near-infrared spectroscopy reveals spectral features indicative of a T dwarf companion, and spectral template fitting yields component types of M8.5 ± 0.5 and T5 ± 1. High-resolution near-infrared spectroscopy with Keck/NIRSPEC reveals pronounced RV variations with a semi-amplitude of 8.2 ± 0.4 km s −1 . From these we determine an orbital period of 147.6 ± 1.5 days and eccentricity of 0.10 ± 0.07, making SDSS J0006−0852AB the third tightest very low mass binary known. This system is also found to have a common proper motion companion, the inactive M7 dwarf LP 704-48, at a projected separation of 820 ± 120 AU. The lack of Hα emission in both M dwarf components indicates that this system is relatively old, as confirmed by evolutionary model analysis of the tight binary. LP 704-48/SDSS J0006−0852AB is the lowest-mass confirmed triple identified to date, and one of only seven candidate and confirmed triples with total masses below 0.3 M currently known. We show that current star and brown dwarf formation models cannot produce triple systems like LP 704-48/SDSS J0006−0852AB, and we rule out Kozai-Lidov perturbations and tidal circularization as a viable mechanism to shrink the inner orbit. The similarities between this system and the recently uncovered low-mass eclipsing triples NLTT 41135AB/41136 and LHS 6343ABC suggest that substellar tertiaries may be common in wide M dwarf pairs.

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A Possible Third Component in the L Dwarf Binary System DENIS-P J020529.0-115925 Discovered with theHubble Space Telescope

Cited by 44 publications

References 21 publications

Resolved Hubble space spectroscopy of ultracool binary systems

Resolved Hubble space spectroscopy of ultracool binary systems

Individual Dynamical Masses of Ultracool Dwarfs* ^† ^‡

Discovery of a Very Low Mass Triple With Late-M and T Dwarf Components: Lp 704-48/SDSS J0006–0852ab

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A Possible Third Component in the L Dwarf Binary System DENIS-P J020529.0-115925 Discovered with theHubble Space Telescope

Cited by 44 publications

References 21 publications

Resolved Hubble space spectroscopy of ultracool binary systems

Resolved Hubble space spectroscopy of ultracool binary systems

Individual Dynamical Masses of Ultracool Dwarfs* † ‡

Discovery of a Very Low Mass Triple With Late-M and T Dwarf Components: Lp 704-48/SDSS J0006–0852ab

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Individual Dynamical Masses of Ultracool Dwarfs* ^† ^‡