Preliminary Results on a Virtual Observatory Search for Companions to Luyten stars

Caballero, J. A.; Miret, F. X.; Genebriera, J.; Tobal, T.; Cairol, J.; Montes, D.

doi:10.1007/978-3-642-11250-8_88

Cited by 5 publications

(7 citation statements)

References 10 publications

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“…First, a physical size must be chosen for the XYZ spatial part of the host-star model. Here, we decided to use a model with a characteristic width of 0.1 pc, corresponding to physical separations of about 20,600 au, larger than some of the widest-separation binaries known to be at least lightly gravitationally bound (Caballero et al 2012;Deacon et al 2014;Marocco et al 2020). This choice for the spatial size of the model should therefore be applicable to systems out to the extreme edge of known bound companions.…”

Section: Chance Alignment Probabilitymentioning

confidence: 99%

Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project

Schneider

Meisner

Gagné

et al. 2021

ApJ

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Through the Backyard Worlds: Planet 9 citizen science project, we have identified a wide-separation (∼10′, ∼9900 au projected) substellar companion to the nearby (∼17.5 pc), mid-M dwarf Ross 19. We have developed a new formalism for determining chance alignment probabilities based on the BANYAN Σ tool, and find a 100% probability that this is a physically associated pair. Through a detailed examination of Ross 19A, we find that the system is metal-poor ([Fe/H] = −0.40 ± 0.12) with an age of -+ 7.2 3.63.8 Gyr. Combining new and existing photometry and astrometry, we find that Ross 19B is one of the coldest known wide-separation companions, with a spectral type on the T/Y boundary, an effective temperature of -+ 500 100 115 K, and a mass in the range 15-40 M Jup . This new, extremely cold benchmark companion is a compelling target for detailed characterization with future spectroscopic observations using facilities such as the Hubble Space Telescope or James Webb Space Telescope.Unified Astronomy Thesaurus concepts: Brown dwarfs (185); Low mass stars (2050)

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Section: Chance Alignment Probabilitymentioning

confidence: 99%

Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project

Schneider

Meisner

Gagné

et al. 2021

ApJ

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“…Using archived surveys along with state-of-the-art follow-up observations enables the combination of different data sources (Caballero et al 2010;Alonso-Floriano et al 2011), offers a way for accurate indirect determinations of quantities like parallax (Gould & Chanamé 2004) or the evolutionary status (Makarov et al 2008), and provides a starting point for extended surveys (like the Palomar/Keck survey of Metchev & Hillenbrand 2009), as well as extreme findings (like the wide ultra-cool binary by Caballero 2007).…”

Section: Multiplicitymentioning

confidence: 99%

The Hercules-Lyra association revisited

Eisenbeiss

Eiff

Roell

et al. 2013

A&A

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Context. The Hercules-Lyra association, a purported nearby young moving group, contains a few tens of zero age main sequence stars of spectral types F to M. The existence and the properties of the Her-Lyr association are controversial and have been discussed in the literature. Aims. The present work reassesses the properties and the member list of the Her-Lyr association based on kinematics and age indicators. Many objects form multiple systems or have low-mass companions and so we need to properly account for multiplicity. Methods. We use our own new imaging observations and archival data to identify multiple systems. The colors and magnitudes of kinematic candidates are compared to isochrones. We derive further information on the age based on Li depletion, rotation, and coronal and chromospheric activity. A set of canonical members is identified to infer mean properties. Membership criteria are derived from the mean properties and used to discard non-members. Results. The candidates selected from the literature belong to 35 stellar systems, 42.9% of which are multiple. Four multiple systems (V538 Aur, DX Leo, V382 Ser, and HH Leo) are confirmed in this work by common proper motion. An orbital solution is presented for the binary system which forms a hierarchical triple with HH Leo. Indeed, a group of candidates displays signatures of youth. Seven canonical members are identified The distribution of Li equivalent widths of canonical Her-Lyr members is spread widely and is similar to that of the Pleiades and the UMa group. Gyrochronology gives an age of 257 ± 46 Myr which is roughly in between the ages of the Pleiades and the Ursa Major group. The measures of chromospheric and coronal activity support the young age. Four membership criteria are presented based on kinematics, lithium equivalent width, chromospheric activity, and gyrochronological age. In total, eleven stars are identified as certain members including co-moving objects plus additional 23 possible members while 14 candidates are doubtful or can be rejected. A comparison to the mass function, however, indicates the presence of a large number of additional low-mass members, which remain unidentified.

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“…Four years before, at the VIII SEA meeting in Santander, he gave two talks: one on formation, evolution and multiplicity of brown dwarfs and giant exoplanets (Caballero 2010a), the other on a Virtual Observatory search for companions to Luyten stars in close collaboration with some of the authors of this proceeding. There, Caballero et al (2010a) showed preliminary results of an Aladin-based survey for companions to high-proper-motion Luyten stars in the Salim & Gould (2003) catalogue. Among the 1947 studied stars (and white dwarfs) with proper motions in the interval 0.5 < µ < 1.0 arcsec a −1 (see Fig.…”

Section: July 2008: Proper-motion Companions To Luyten Starsmentioning

confidence: 99%

Collaborating with "professional" amateurs: low-mass stars in fragile multiple system

Caballero,

Genebriera,

Tobal

et al. 2012

Preprint

Self Cite

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The boundary between professional and amateur astronomers gets narrower and narrower. We present several real examples, most of them published in refereed journals, of works resulting from fruitful collaborations between key amateur astronomers in Spain and professional colleagues. The common denominator of these works is the search for binaries, mostly nearby, wide, common proper-motion pairs with low-mass stellar components, including some of the most fragile systems ever found.

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Preliminary Results on a Virtual Observatory Search for Companions to Luyten stars

Cited by 5 publications

References 10 publications

Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project

Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project

The Hercules-Lyra association revisited

Collaborating with "professional" amateurs: low-mass stars in fragile multiple system

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