Starspot modelling of the TESS light curve of CVSO 30

Koen, C.

doi:10.1051/0004-6361/202140400

Cited by 2 publications

(4 citation statements)

References 26 publications

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“…That fits with Yu et al ( 2015 ), who came to the conclusion that CVSO 30 may be weakly accreting based on their measured strength and breadth of the H α line profile. Koen ( 2021 ) presents a model, where CVSO 30 is considered to be a binary and the variability is the result of stellar spots. From pure statistics the model can reproduce the detected variations inside MNRAS 511, 3487-3500 (2022) the TESS photometry, but the assumed filling factors e.g.…”

Section: Discussion a N D C O N C L U S I O Nmentioning

confidence: 99%

“…Bouma et al ( 2020 ) presented also several other possible explanations, which need to be considered further. Koen ( 2021 ) combined the binary scenario with star-spot models to explain the variability of CVSO 30 based on TESS measurements in one passband. Ho we ver, a filling factor of roughly 0.5 seems by far too large for normal spots and would have been probably detected in previous high-resolution, high signal-to-noise spectra, as e.g.…”

Section: Introductionmentioning

confidence: 99%

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Young Exoplanet Transit Initiative follow-up observations of the T Tauri star CVSO 30 with transit-like dips

Bischoff

Raetz

Fernández

et al. 2022

Monthly Notices of the Royal Astronomical Society

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The T Tauri star CVSO 30, also known as PTFO 8-8695, was studied intensively with ground based telescopes as well as with satellites over the last decade. It showed a variable light curve with additional repeating planetary transit-like dips every ∼10.8 h. However, these dimming events changed in depth and duration since their discovery and from autumn 2018 on, they were not even present or near the predicted observing times. As reason for the detected dips and their changes within the complex light curve, e.g. a disintegrating planet, a circumstellar dust clump, stellar spots, possible multiplicity and orbiting clouds at a Keplerian co-rotating radius were discussed and are still under debate. In this paper, we present additional optical monitoring of CVSO 30 with the meter class telescopes of the Young Exoplanet Transit Initiative in Asia and Europe over the last seven years and characterize CVSO 30 with the new Early Data Release 3 of the ESA Gaia Mission. As a result, we describe the evolution of the dimming events in the optical wavelength range since 2014 and present explanatory approaches for the observed variabilities. We conclude that orbiting clouds of gas at a Keplerian co-rotating radius are the most promising scenario to explain most changes in CVSO 30’s light curve.

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Section: Discussion a N D C O N C L U S I O Nmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Young Exoplanet Transit Initiative follow-up observations of the T Tauri star CVSO 30 with transit-like dips

Bischoff

Raetz

Fernández

et al. 2022

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…That fits with Yu et al (2015), who came to the conclusion that CVSO 30 may be weakly accreting based on their measured strength and breadth of the Hα line profile. Koen (2021) presents a model, where CVSO 30 is considered to be a binary and the variability is the result of stellar spots. From pure statistics the model can reproduce the detected variations inside the TESS photometry, but the assumed filling factors e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Bouma et al (2020) presented also several other possible explanations, which need to be considered further. Koen (2021) combined the binary scenario with star spot models to explain the variability of CVSO 30 based on TESS measurements in one passband. However, a filling factor of roughly 0.5 seems by far too large for normal spots and would have been probably detected in previous high-resolution, high signal-to-noise spectra, as e.g.…”

Section: Introductionmentioning

confidence: 99%

YETI follow-up observations of the T Tauri star CVSO30 with transit-like dips

Bischoff,

Raetz,

Fernández

et al. 2022

Preprint

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The T Tauri star CVSO 30, also known as PTFO 8-8695, was studied intensively with ground based telescopes as well as with satellites over the last decade. It showed a variable light curve with additional repeating planetary transit-like dips every ∼ 10.8 h. However, these dimming events changed in depth and duration since their discovery and from autumn 2018 on, they were not even present or near the predicted observing times. As reason for the detected dips and their changes within the complex light curve, e.g. a disintegrating planet, a circumstellar dust clump, stellar spots, possible multiplicity and orbiting clouds at a Keplerian co-rotating radius were discussed and are still under debate. In this paper, we present additional optical monitoring of CVSO 30 with the meter class telescopes of the Young Exoplanet Transit Initiative in Asia and Europe over the last seven years and characterize CVSO 30 with the new Early Data Release 3 of the ESA Gaia Mission. As a result, we describe the evolution of the dimming events in the optical wavelength range since 2014 and present explanatory approaches for the observed variabilities. We conclude that orbiting clouds of gas at a Keplerian co-rotating radius are the most promising scenario to explain most changes in CVSO 30's light curve.

show abstract

Starspot modelling of the TESS light curve of CVSO 30

Cited by 2 publications

References 26 publications

Young Exoplanet Transit Initiative follow-up observations of the T Tauri star CVSO 30 with transit-like dips

Young Exoplanet Transit Initiative follow-up observations of the T Tauri star CVSO 30 with transit-like dips

YETI follow-up observations of the T Tauri star CVSO30 with transit-like dips

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