Dust evolution in the circumstellar disc of the unclassified B[e] star HD 50138

Varga, J.; Gerják, T.; Ábrahám, P.; Chen, L.; Gabányi, K. É.; Kóspál, Á.

doi:10.1093/mnras/stz486

Cited by 7 publications

(6 citation statements)

References 60 publications

(120 reference statements)

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“…TIC 123545883 = V743 Mon: An unclassified B[e] star, or potentially a Herbig Ae/Be star (Varga et al 2019), where severe low-frequency stochastic variability is its main feature in TESS.…”

Section: B2 Firmly Nonclassical Be Stars Rejected From the Samplementioning

confidence: 99%

Classifying Be Star Variability With TESS. I. The Southern Ecliptic

Labadie-Bartz

Carciofi

Amorim

et al. 2022

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TESS photometry is analyzed for 430 classical Be stars observed in the first year of the mission. The often complex and diverse variability of each object in this sample is classified to obtain an understanding of the behavior of this class as a population. Ninety-seven percent of the systems are variable above the noise level, with timescales spanning nearly the entire range of what is accessible with TESS, from tens of minutes to tens of days. The variability seen with TESS is summarized as follows. Nearly every system contains multiple periodic signals in the frequency regime between about 0.5 and 4 day−1. One or more groups of closely spaced frequencies is the most common feature, present in 87% of the sample. Among the Be stars with brightening events that are characteristic of mass ejection episodes (18% of the full sample, or 31% of early-type stars), all have at least one frequency group, and the majority of these (83%) show a concurrent temporary amplitude enhancement in one or more frequency groups. About one-third (34%) of the sample is dominated by longer-term trends (timescales >2 day). Low-frequency stochastic signals are prominent in about 25% of the sample, with varying degrees of intensity. Higher-frequency signals (6 < f < 15 day−1) are sometimes seen (in 15% of the sample) and in most cases likely reflect p-mode pulsation. In rare cases (∼3%), even higher frequencies beyond the traditional p-mode regime (f > 15 day−1) are observed.

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“…TIC 123545883 = V743 Mon: An unclassified B[e] star, or potentially a Herbig Ae/Be star (Varga et al 2019), where severe low-frequency stochastic variability is its main feature in TESS.…”

Section: B2 Firmly Nonclassical Be Stars Rejected From the Samplementioning

confidence: 99%

Classifying Be Star Variability With TESS. I. The Southern Ecliptic

Labadie-Bartz

Carciofi

Amorim

et al. 2022

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“…However, even given these parameters, distinguishing between B[e] classifications can be difficult. For example, a thorough investigation by Varga et al (2019), which studied HD 50138, concluded that the evolutionary state of HD 50138 could not be unambiguously determined through mid-infrared spectroscopy. We conclude that the structures observed around the FS CMa candidate stars in our Q f and U f images are more similar to the expected structures of protoplanetary disks rather than outflow from FS CMa or another type of evolved star.…”

Section: Classification Of Fs Cma Starsmentioning

confidence: 99%

Gemini-LIGHTS: Herbig Ae/Be and Massive T Tauri Protoplanetary Disks Imaged with Gemini Planet Imager

Rich¹,

Monnier²,

Aarnio³

et al. 2022

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We present the complete sample of protoplanetary disks from the Gemini- Large Imaging with the Gemini Planet Imager Herbig/T Tauri Survey, which observed bright Herbig Ae/Be stars and T Tauri stars in near-infrared polarized light to search for signatures of disk evolution and ongoing planet formation. The 44 targets were chosen based on their near- and mid-infrared colors, with roughly equal numbers of transitional, pre-transitional, and full disks. Our approach explicitly did not favor well-known, “famous” disks or those observed by the Atacama Large Millimeter/submillimeter Array, resulting in a less-biased sample suitable to probe the major stages of disk evolution during planet formation. Our optimized data reduction allowed polarized flux as low as 0.002% of the stellar light to be detected, and we report polarized scattered light around 80% of our targets. We detected point-like companions for 47% of the targets, including three brown dwarfs (two confirmed, one new), and a new super-Jupiter-mass candidate around V1295 Aql. We searched for correlations between the polarized flux and system parameters, finding a few clear trends: the presence of a companion drastically reduces the polarized flux levels, far-IR excess correlates with polarized flux for nonbinary systems, and systems hosting disks with ring structures have stellar masses <3 M⊙. Our sample also included four hot, dusty “FS CMa” systems, and we detected large-scale ( >100 au) scattered light around each, signs of extreme youth for these enigmatic systems. Science-ready images are publicly available through multiple distribution channels using a new FITS file standard that has been jointly developed with members of the Very Large Telescope Spectro-polarimetric High-contrast Exoplanet Research team.

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“…However, even given these parameters, distinguishing between B[e] classifications can be difficult. For example, a thorough investigation by Varga et al (2019) which studied HD 50138 concluded that the evolutionary state of HD 50138 could not be unambiguously determined through mid-IR spectroscopy. We conclude that the structures observed around the FS CMa candidate stars in our Q φ and U φ images are more similar to the expected structures of protoplanetary disks rather than outflow from FS CMa or another type of evolved star.…”

Section: Classification Of Fs Cma Starsmentioning

confidence: 99%

Gemini-LIGHTS: Herbig Ae/Be and massive T-Tauri protoplanetary disks imaged with Gemini Planet Imager

Rich,

Monnier,

Aarnio

et al. 2022

Preprint

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We present the complete sample of protoplanetary disks from the Gemini-Large Imaging with GPI Herbig/T-tauri Survey (Gemini-LIGHTS) which observed bright Herbig Ae/Be stars and T-Tauri stars in near-infrared polarized light to search for signatures of disk evolution and ongoing planet formation. The 44 targets were chosen based on their near-and mid-infrared colors, with roughly equal numbers of transitional, pre-transitional, and full disks. Our approach explicitly did not favor well-known, "famous" disks or those observed by ALMA, resulting in a less-biased sample suitable to probe the major stages of disk evolution during planet formation. Our optimized data reduction allowed polarized flux as low as 0.002% of the stellar light to be detected, and we report polarized scattered light around 80% of our targets. We detected point-like companions for 47% of the targets, including 3 brown dwarfs (2 confirmed, 1 new), and a new super-Jupiter mass candidate around V1295 Aql. We searched for correlations between the polarized flux and system parameters, finding a few clear trends: presence of a companion drastically reduces the polarized flux levels, far-IR excess correlates with polarized flux for non-binary systems, and systems hosting disks with ring structures have stellar masses < 3 M . Our sample also included four hot, dusty "FS CMa" systems and we detected large-scale (> 100 au) scattered light around each, signs of extreme youth for these enigmatic systems. Science-ready images are publicly available through multiple distribution channels using a new FITS file standard jointly developed with members of the VLT/SPHERE team.

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Dust evolution in the circumstellar disc of the unclassified B[e] star HD 50138

Cited by 7 publications

References 60 publications

Classifying Be Star Variability With TESS. I. The Southern Ecliptic

Classifying Be Star Variability With TESS. I. The Southern Ecliptic

Gemini-LIGHTS: Herbig Ae/Be and Massive T Tauri Protoplanetary Disks Imaged with Gemini Planet Imager

Gemini-LIGHTS: Herbig Ae/Be and massive T-Tauri protoplanetary disks imaged with Gemini Planet Imager

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