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High-resolution ALMA and HST images of q1 Eri : an asymmetric debris disc with an eccentric Jupiter
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Lovell, J. B., Marino, S., Wyatt, M. C., Kennedy, Grant M., MacGregor, M. A., Stapelfeldt, K., Dent, B., Krist, J., Matrà, L., Kral, Q., Panić, O., Pearce, T. D. and Wilner, D. (2021) High-resolution ALMA and HST images of q1 Eri : an asymmetric debris disc with an eccentric Jupiter. Monthly Notices of the Royal Astronomical Society, 506 (2). pp. 1978-2001. doi:10.1093/mnras/stab1678
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Official URL: http://dx.doi.org/10.1093/mnras/stab1678
Abstract
We present Atacama Large Millimetre/sub-Millimetre Array (ALMA) 1.3 and 0.86 mm observations of the nearby (17.34 pc) F9V star q1 Eri (HD 10647, HR 506). This system, with age ~1.4 Gyr, hosts a ~2 au radial velocity planet and a debris disc with the highest fractional luminosity of the closest 300 FGK type stars. The ALMA images, with resolution ~0 ′′. 5, reveal a broad (34-134 au) belt of millimetre emission inclined by 76.7 ± 1.0 degrees with maximum brightness at 81.6 ± 0.5 au. The images reveal an asymmetry, with higher flux near the south-west ansa, which is also closer to the star. Scattered light observed with the Hubble Space Telescope is also asymmetric, being more radially extended to the north-east. We fit the millimetre emission with parametric models and place constraints on the disc morphology, radius, width, dust mass, and scale height. We find that the south-west ansa asymmetry is best fitted by an extended clump on the inner edge of the disc, consistent with perturbations from a planet with mass 8M⊕−11MJup at ~60 au that may have migrated outwards, similar to Neptune in our Solar system. If the measured vertical aspect ratio of h = 0.04 ± 0.01 is due to dynamical interactions in the disc, then this requires perturbers with sizes >1200 km. We find tentative evidence for a 0.86 mm excess within 10 au, 70±22μ Jy, that may be due to an inner planetesimal belt. We find no evidence for CO gas, but set an upper bound on the CO gas mass of 4 × 10-6 M⊕ ( 3σ ), consistent with cometary abundances in the Solar system.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of Science > Physics | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Circumstellar matter , Planetary systems, Interferometry , Space debris, Space environment | ||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||
| Publisher: | Oxford University Press | ||||||||||||||||||
| ISSN: | 1745-3933 | ||||||||||||||||||
| Official Date: | September 2021 | ||||||||||||||||||
| Dates: |
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| Volume: | 506 | ||||||||||||||||||
| Number: | 2 | ||||||||||||||||||
| Page Range: | pp. 1978-2001 | ||||||||||||||||||
| DOI: | 10.1093/mnras/stab1678 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record J B Lovell, S Marino, M C Wyatt, G M Kennedy, M A MacGregor, K Stapelfeldt, B Dent, J Krist, L Matrà, Q Kral, O Panić, T D Pearce, D Wilner, High-resolution ALMA and HST images of q1 Eri: an asymmetric debris disc with an eccentric Jupiter, Monthly Notices of the Royal Astronomical Society, Volume 506, Issue 2, September 2021, Pages 1978–2001, is available online at: https://doi.org/10.1093/mnras/stab1678 | ||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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