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  A Possible Transit of a Disintegrating Exoplanet in the Nearby Multiplanet System DMPP-1

Jones, M. H., Haswell, C. A., Barnes, J. R., Staab, D., & Heller, R. (2020). A Possible Transit of a Disintegrating Exoplanet in the Nearby Multiplanet System DMPP-1. Astrophysical Journal, Letters, 895(1): L17. doi:10.3847/2041-8213/ab8f2b.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-971F-E Version Permalink: http://hdl.handle.net/21.11116/0000-0006-9720-B
Genre: Journal Article

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 Creators:
Jones, Mark H., Author
Haswell, Carole A., Author
Barnes, John R., Author
Staab, Daniel, Author
Heller, René1, Author              
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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 Abstract: We analyze TESS photometry of DMPP-1 (HD 38677; TIC 66560666), a nearby F8V star hosting hot super-Earth planets and a warm Neptune. Using the Transit Least Squares algorithm and other methods we find a transit signal at $P={3.2854}_{-0.0025}^{+0.0032}$ days with depth ${87}_{-30}^{+25}$ ppm and false alarm probability 1.6%. This is shallower than hitherto published TESS discoveries. The 3.285 day signal is recovered for several, but not all, methods for detrending stellar astrophysical variability. Further observations are needed to improve the significance of the detection. If this transit were due to an Earth-like rocky planet it would have been detected in the RV data, but it is not. The TESS data cover seven individual transits, one of which is consistent with zero depth. The insolation of the putative planet is 990 S ⊕, typical of fluxes experienced by the three known catastrophically disintegrating exoplanets (CDEs). The transits can be self-consistently attributed to a CDE with a mass below the RV detection threshold. We searched for transits of the known RV planets, finding null results and detection thresholds of <100 ppm, which we quantify for each. The DMPP-1 planetary system was discovered as a consequence of circumstellar gas attributed to ablation of hot planets. The RV planets may have been ablated to near-pure iron cores. We place limits on the orbital inclinations of the RV planets where the expected transit depth exceeds the detection threshold. If the 3.2854 day transit detection is confirmed, e.g., with CHEOPS photometry, DMPP-1 would be a first-rate target for James Webb Space Telescope spectroscopy.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3847/2041-8213/ab8f2b
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Title: Astrophysical Journal, Letters
  Other : ApJL
Source Genre: Journal
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Publ. Info: Bristol, UK : Institute of Physics Publishing (IOP)
Pages: - Volume / Issue: 895 (1) Sequence Number: L17 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_1