Searching for Hα-emitting sources in the gaps of five transitional disks Article Swipe
N. Huélamo
,
G. Chauvin
,
I. Mendigutía
,
E. T. Whelan
,
J. M. Alcalá
,
Gabriele Cugno
,
H. M. Schmid
,
I. de Gregorio‐Monsalvo
,
A. Zurlo
,
D. Barrado
,
M. Benisty
,
Sascha P. Quanz
,
H. Bouy
,
B. Montesinos
,
Y. Beletsky
,
J. Szulágyi
·
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202243918
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202243918
Context. (Pre-)Transitional disks show gaps and cavities that can be related to ongoing planet formation. According to theory, young embedded planets can accrete material from the circumplanetary and circumstellar disks and can be detected using accretion tracers, such as the H α emission line. Aims. We aim to detect accreting protoplanets within the cavities of five (pre-)transitional disks through adaptive-optics(AO)-assisted spectral angular differential imaging in the optical regime. Methods. We performed simultaneous AO observations in the H α line and the adjacent continuum using the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) with the Zurich Imaging Polarimeter (ZIMPOL) at the Very Large Telescope (VLT). We combined spectral and angular differential imaging techniques to increase the contrast in the innermost regions close to the star and search for the signature of young accreting protoplanets. Results. The reduced images show no clear H α point source around any of the targets. We report the presence of faint H α emission around TW Hya and HD163296: while the former is most probably an artifact related to a spike, the nature of the latter remains unclear. The spectral and angular differential images yield contrasts of 6–8 magnitudes at ~100 mas from the central stars, except in the case of LkCa15, with values of ~3 mag. We used the contrast curves to estimate average upper limits to the H α line luminosity of L H α ~ 5 × 10 -6 L ⊙ at separations ≥200 mas for TW Hya, RXJ1615, and T Cha, while for HD163296 and LkCa15 we derive values of ~3 × 10 −5 L ⊙ . We estimated upper limits to the accretion luminosity of potential protoplanets, obtaining that planetary models provide an average value of L acc ~ 10 −4 L ⊙ at 200 mas, which is about two orders of magnitude higher than the L acc estimated from the extrapolation of the L H α - L acc stellar relationship. Conclusions. When considering all the objects observed with SPHERE/ZIMPOL in the H α line, 5 in this work and 13 from the literature, we can explain the lack of protoplanet detections by a combination of factors, such as a majority of low-mass, low-accreting planets; potential episodic accretion; significant extinction from the circumstellar and circumplanetary disks; and the fact that the contrast is less favorable at separations of smaller than 100 mas, where giant planets are more likely to form.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1051/0004-6361/202243918
- https://www.aanda.org/articles/aa/pdf/2022/12/aa43918-22.pdf
- OA Status
- hybrid
- Cited By
- 21
- References
- 148
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4306841802
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4306841802Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1051/0004-6361/202243918Digital Object Identifier
- Title
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Searching for Hα-emitting sources in the gaps of five transitional disksWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2022Year of publication
- Publication date
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2022-10-19Full publication date if available
- Authors
-
N. Huélamo, G. Chauvin, I. Mendigutía, E. T. Whelan, J. M. Alcalá, Gabriele Cugno, H. M. Schmid, I. de Gregorio‐Monsalvo, A. Zurlo, D. Barrado, M. Benisty, Sascha P. Quanz, H. Bouy, B. Montesinos, Y. Beletsky, J. SzulágyiList of authors in order
- Landing page
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https://doi.org/10.1051/0004-6361/202243918Publisher landing page
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https://www.aanda.org/articles/aa/pdf/2022/12/aa43918-22.pdfDirect link to full text PDF
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://www.aanda.org/articles/aa/pdf/2022/12/aa43918-22.pdfDirect OA link when available
- Concepts
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Physics, Astrophysics, Accretion (finance), Protoplanet, Stars, Planet, Stellar classification, Angular diameter, Astronomy, Protoplanetary diskTop concepts (fields/topics) attached by OpenAlex
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21Total citation count in OpenAlex
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2025: 8, 2024: 5, 2023: 7, 2022: 1Per-year citation counts (last 5 years)
- References (count)
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148Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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| primary_location.landing_page_url | https://doi.org/10.1051/0004-6361/202243918 |
| publication_date | 2022-10-19 |
| publication_year | 2022 |
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