The discrepancy between dynamical and theoretical mass in the triplet-system 2MASS J10364483+1521394

Calissendorff, Per; Janson, Markus; Köhler, Rainer H.; Durkan, S.; Hippler, S.; Dai, Xiaolin; Brandner, W.; Schlieder, Joshua E.; Henning, Thomas

doi:10.1051/0004-6361/201730725

Cited by 13 publications

(26 citation statements)

References 45 publications

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“…The J-band spectrum was corrected from the telluric contribution using a different standard star compared to the H+K band, and the only system in our sample to use different standard telluric stars for different bands. Calissendorff et al (2017) placed orbital constraints for the outer binary and estimated individual dynamical masses to be ≈0.24 M for each component. The theoretical model best-fit procedure suggests an effective temperature of T eff = 2900 K for each component, and a surface gravity of log g = 4.5 that is consistent with the individual spectral line analysis.…”

Section: Resultsmentioning

confidence: 99%

“…has been made in recent years to enhance the characterisation of cool dwarfs, for mid-to late M types and for substellar objects (e.g. Bouy et al 2008;Bonnefoy et al 2009Bonnefoy et al , 2014Dupuy et al 2010;Schlieder et al 2014;Calissendorff et al 2017Calissendorff et al , 2019Calissendorff & Janson 2018). Furthermore, with the recent abundant discoveries of planets with M-star hosts (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Characterising young visual M-dwarf binaries with near-infrared integral field spectra

Calissendorff

Janson²,

Bonnefoy³

2020

A&A

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We present the results from an integral field spectroscopy study of seven close visual binary pairs of young M-dwarf multiple systems. The target systems are part of the astrometric monitoring AstraLux programme, surveying hundreds of M-dwarf systems for multiplicity and obtaining astrometric epochs for orbital constraints. Our new VLT/SINFONI data provides resolved spectral type classifications in the J, H, and K bands for seven of these low-mass M-dwarf binaries, which we determine by comparing them to empirical templates and examining the strength of water absorption in the K band. The medium resolution K-band spectra also allows us to derive effective temperatures for the individual components. All targets in the survey display several signs of youth, and some have kinematics similar to young moving groups, or low surface gravities which we determined from measuring equivalent widths of gravity sensitive alkali lines in the J band. Resolved photometry from our targets is also compared with isochrones from theoretical evolutionary models, further implying young ages. Dynamical masses will be provided from continued monitoring of these systems, which can be seen as emblematic binary benchmarks that may be used to calibrate evolutionary models for low-mass stars in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterising young visual M-dwarf binaries with near-infrared integral field spectra

Calissendorff

Janson²,

Bonnefoy³

2020

A&A

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“…This seems to be an overly complicated solution. The isochrones assume roughly solar composition, so a significantly different metallicity could cause a deviation from these isochrones, but this is not expected in the solar neighbourhood, and for example does not explain the case of J1036 BC, where a range of metallicities were tested in the models (Calissendorff et al 2017). One possible explanation is missing physics in the isochronal models, which might impose incorrect slopes or offsets in the isochrones.…”

Section: Isochronal Analysismentioning

confidence: 99%

Dynamical masses of M-dwarf binaries in young moving groups

Janson

Durkan

Bonnefoy

et al. 2018

A&A

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Low-mass stars exhibit substantial pre-main sequence evolution during the first ∼100 Myr of their lives. Thus, young M-type stars are prime targets for isochronal dating, especially in young moving groups (YMGs), which contain large amounts of stars in this mass and age range. If the mass and luminosity of a star can both be directly determined, this allows for a particularly robust isochronal analysis. This motivates in-depth studies of low-mass binaries with spatially resolvable orbits, where dynamical masses can be derived. Here we present the results of an observing campaign dedicated to orbital monitoring of AB Dor Ba/Bb, which is a close M-dwarf pair within the quadruple AB Dor system. We have acquired eight astrometric epochs with the SPHERE/ZIMPOL and NACO instruments, which we combine with literature data to improve the robustness and precision for the orbital characterization of the pair. We find a system mass 0.66 +0.12 −0.12 M and bolometric luminosities in log L/L of −2.02 ± 0.02 and −2.11 ± 0.02 for AB Dor Ba and Bb, respectively. These measurements are combined with other YMG pairs in the literature to start building a framework of empirical isochrones in mass-luminosity space. This can be used to calibrate theoretical isochrones and to provide a model-free basis for assessing relative stellar ages. We note a tentative emerging trend where the youngest moving group members are largely consistent with theoretical expectations, while stars in older associations such as the AB Dor moving group appear to be systematically underluminous relative to isochronal expectations.

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“…We detect the companions at projected separations of 14.82au and 17.78au, with the companions forming a nearly equal-mass binary at a projected separation of 0 15 (3 au). Calissendorff et al (2017) recently analyzed the orbits and masses of this known triple system.…”

Section: Triple Systemsmentioning

confidence: 99%

Large Adaptive Optics Survey for Substellar Objects around Young, Nearby, Low-mass Stars with Robo-AO

Salama

Baranec

et al. 2021

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We present results from the Large Adaptive optics Survey for Substellar Objects, where the goal is to directly image new substellar companions (<70 M Jup ) at wide orbital separations (50 au) around young (300 Myr), nearby (<100 pc), low-mass (≈0.1-0.8 M  ) stars. We report on 427 young stars imaged in the visible (i′) and nearinfrared (J or H ) simultaneously with Robo-AO on the Kitt Peak 2.1 m telescope and later the Maunakea University of Hawaii 2.2 m telescope. To undertake the observations, we commissioned a new infrared camera for Robo-AO that uses a low-noise high-speed SAPHIRA avalanche photodiode detector. We detected 121 companion candidates around 111 stars, of which 62 companions are physically associated based on Gaia DR2 parallaxes and proper motions, another 45 require follow-up observations to confirm physical association, and 14 are background objects. The companion separations range from 2 to 1101 au and reach contrast ratios of 7.7 mag in the nearinfrared compared to the primary. The majority of confirmed and pending candidates are stellar companions, with ∼5 being potentially substellar and requiring follow-up observations for confirmation. We also detected a 43±9 M Jup and an 81±5 M Jup companion that were previously reported. We found 34 of our targets have acceleration measurements detected using Hipparcos-Gaia proper motions. Of those, -+ 58 1412 % of the 12 stars with imaged companion candidates have significant accelerations (c > 11.8 2), while only -+ 23 6 11 % of the remaining 22 stars with no detected companion have significant accelerations. The significance of the acceleration decreases with increasing companion separation. These young accelerating low-mass stars with companions will eventually yield dynamical masses with future orbit monitoring.

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The discrepancy between dynamical and theoretical mass in the triplet-system 2MASS J10364483+1521394

Cited by 13 publications

References 45 publications

Characterising young visual M-dwarf binaries with near-infrared integral field spectra

Characterising young visual M-dwarf binaries with near-infrared integral field spectra

Dynamical masses of M-dwarf binaries in young moving groups

Large Adaptive Optics Survey for Substellar Objects around Young, Nearby, Low-mass Stars with Robo-AO

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