Discovery of a long-lived, high-amplitude dusty infrared transient

Britt, C. T.; Maccarone, Thomas J.; Green, J.D.; Jonker, P. G.; Hynes, R. I.; Torres, M. A. P.; Strader, Jay; Chomiuk, Laura; Salinas, R.; Lucas, P. W.; Peña, C. Contreras; Kurtev, R.; Heinke, C. O.; Smith, Leigh C.; Wright, N. J.; Johnson, C.; Steeghs, D.; Nelemans, G.

doi:10.1093/mnras/stw1182

Cited by 7 publications

(3 citation statements)

References 72 publications

(112 reference statements)

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“…Another example use of VIRAC for constraining distance is that of Britt et al (2016), where VIRAC proper motion and parallax upper limits were used to determine that the very unusual long-duration transient source CX330 is outside the solar neighbourhood and moving too slowly to be connected to any known star forming complex, assuming an age of order 1 Myr. VIRAC kinematic distance estimates are most useful for objects known to be young and hence very likely to have space velocity consistent with disk rotation, these objects would include young objects (e.g.…”

Section: Other Uses: Kinematic Distance Estimates and Cluster Decontamentioning

confidence: 99%

VIRAC: the VVV Infrared Astrometric Catalogue

Smith

Lucas

Kurtev

et al. 2017

Monthly Notices of the Royal Astronomical Society

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116

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We present VIRAC version 1, a near-infrared proper motion and parallax catalogue of the VISTA VVV survey for 312,587,642 unique sources averaged across all overlapping pawprint and tile images covering 560 deg 2 of the bulge of the Milky Way and southern disk. The catalogue includes 119 million high quality proper motion measurements, of which 47 million have statistical uncertainties below 1 mas yr −1 . In the 11 < K s < 14 magnitude range the high quality motions have a median uncertainty of 0.67 mas yr −1 . The catalogue also includes 6,935 sources with quality-controlled 5 σ parallaxes with a median uncertainty of 1.1 mas. The parallaxes show reasonable agreement with the TYCHO-Gaia Astrometric Solution (TGAS), though caution is advised for data with modest significance. The SQL database housing the data is made available via the web. We give example applications for studies of Galactic structure, nearby objects (low mass stars and brown dwarfs, subdwarfs, white dwarfs) and kinematic distance measurements of YSOs. Nearby objects discovered include LTT 7251 B, an L7 benchmark companion to a G dwarf with over 20 published elemental abundances, a bright L sub-dwarf, VVV 1256-6202, with extremely blue colours and nine new members of the 25 pc sample. We also demonstrate why this catalogue remains useful in the era of Gaia. Future versions will be based on profile fitting photometry, use the Gaia absolute reference frame and incorporate the longer time baseline of the VVV extended survey (VVVX).

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Section: Other Uses: Kinematic Distance Estimates and Cluster Decontamentioning

confidence: 99%

VIRAC: the VVV Infrared Astrometric Catalogue

Smith

Lucas

Kurtev

et al. 2017

Monthly Notices of the Royal Astronomical Society

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141

116

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“…This material could originate from a remnant envelope of the young star itself, or could be a quiescent part of the molecular cloud encountered by the young star after traveling a significant distance from its birthplace (e.g. Britt et al 2016). Indeed, a young star may cross its parent cluster within ∼1 Myr (Kraus et al 2008;Zari et al 2019), which is sig-nificantly less than the lifetime of the parent molecular cloud.…”

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confidence: 99%

Variability of the Great Disk Shadow in Serpens

Pontoppidan,

Green,

Pauly

et al. 2020

Preprint

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We present multi-epoch Hubble Space Telescope imaging of the Great Disk Shadow in the Serpens star-forming region. The near-infrared images show strong variability of the disk shadow, revealing dynamics of the inner disk on time scales of months. The Great Shadow is projected onto the Serpens reflection nebula by an unresolved protoplanetary disk surrounding the young intermediate-mass star SVS2/CK3/EC82. Since the shadow extends out to a distance of at least 17,000 au, corresponding to a light travel time of 0.24 years, the images may reveal detailed changes in the disk scale height and position angle on time scales as short as a day, corresponding to the angular resolution of the images, and up to the 1.11 year span between two observing epochs. We present a basic retrieval of temporal changes in the disk density structure, based on the images. We find that the inner disk changes position angle on time scales of months, and that the change is not axisymmetric, suggesting the presence of a non-axisymmetric dynamical forcing on ∼1 au size scales. We consider two different scenarios, one in which a quadrupolar disk warp orbits the central star, and one in which an unequal-mass binary orbiting out of the disk plane displaces the photo-center relative to the shadowing disk. Continued space-based monitoring of the Serpens Disk Shadow is required to distinguish between these scenarios, and could provide unique, and detailed, insight into the dynamics of inner protoplanetary disks not available through other means.

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“…For example, Ratti et al (2013) found a quiescent long orbital period CV, while Hynes et al (2014) reported a candidate symbiotic X-ray binary associated with a carbon star. Britt et al (2016) identified a high-amplitude IR transient which they interpret as a young stellar object (YSO) with an accretion disk instability event, and Wevers et al (2016b) discovered a high state AM CVn (compact double WD) system. These examples illustrate the large diversity of (sometimes rare and peculiar) objects that are being discovered in the GBS.…”

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confidence: 99%

Spectroscopic classification of X-ray sources in the Galactic Bulge Survey

Wevers

Torres

Jonker

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the classification of 26 optical counterparts to X-ray sources discovered in the Galactic Bulge Survey. We use (time-resolved) photometric and spectroscopic observations to classify the X-ray sources based on their multi-wavelength properties. We find a variety of source classes, spanning different phases of stellar/binary evolution. We classify CX21 as a quiescent cataclysmic variable (CV) below the period gap, and CX118 as a high accretion rate (nova-like) CV. CXB12 displays excess UV emission, and could contain a compact object with a giant star companion, making it a candidate symbiotic binary or quiescent low mass X-ray binary (although other scenarios cannot be ruled out). CXB34 is a magnetic CV (polar) that shows photometric evidence for a change in accretion state. The magnetic classification is based on the detection of X-ray pulsations with a period of 81 ± 2 min. CXB42 is identified as a young stellar object, namely a weak-lined T Tauri star exhibiting (to date unexplained) UX Ori-like photometric variability. The optical spectrum of CXB43 contains two (resolved) unidentified double-peaked emission lines. No known scenario, such as an AGN or symbiotic binary, can easily explain its characteristics. We additionally classify 20 objects as likely active stars based on optical spectroscopy, their X-ray to optical flux ratios and photometric variability. In 4 cases we identify the sources as binary stars.

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Discovery of a long-lived, high-amplitude dusty infrared transient

Cited by 7 publications

References 72 publications

VIRAC: the VVV Infrared Astrometric Catalogue

VIRAC: the VVV Infrared Astrometric Catalogue

Variability of the Great Disk Shadow in Serpens

Spectroscopic classification of X-ray sources in the Galactic Bulge Survey

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