TOI-1416: A system with a super-Earth planet with a 1.07 d period
Article
Ciardi, D. R. and Isaacson, H.. 2023. "TOI-1416: A system with a super-Earth planet with a 1.07 d period." Astronomy and Astrophysics: a European journal. 677. https://doi.org/10.1051/0004-6361/202346370
| Article Title | TOI-1416: A system with a super-Earth planet with a 1.07 d period |
|---|---|
| ERA Journal ID | 1050 |
| Article Category | Article |
| Authors | Ciardi, D. R. and Isaacson, H. |
| Journal Title | Astronomy and Astrophysics: a European journal |
| Journal Citation | 677 |
| Article Number | A12 |
| Number of Pages | 29 |
| Year | 2023 |
| Publisher | EDP Sciences |
| Place of Publication | France |
| ISSN | 0004-6361 |
| 1432-0746 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202346370 |
| Web Address (URL) | https://www.aanda.org/articles/aa/abs/2023/09/aa46370-23/aa46370-23.html |
| Abstract | TOI-1416 (BD+42 2504, HIP 70705) is a V =10 late G- or early K-type dwarf star. TESS detected transits in its Sectors 16, 23, and 50 with a depth of about 455 ppm and a period of 1.07 days. Radial velocities (RVs) confirm the presence of the transiting planet TOI-1416 b, which has a mass of 3.48 ± 0.47 M• and a radius of 1.62 ± 0.08 R•, implying a slightly sub-Earth density of 4.500.83+0.99 g cm3. The RV data also further indicate a tentative planet, c, with a period of 27.4 or 29.5 days, whose nature cannot be verified due to strong suspicions of contamination by a signal related to the Moon s synodic period of 29.53 days. The nearly ultra-short-period planet TOI-1416 b is a typical representative of a short-period and hot (Teq ? 1570 K) super-Earth-like planet. A planet model of an interior of molten magma containing a significant fraction of dissolved water provides a plausible explanation for its composition, and its atmosphere could be suitable for transmission spectroscopy with JWST. The position of TOI-1416 b within the radius-period distribution corroborates the idea that planets with periods of less than one day do not form any special group. It instead implies that ultra-short-period planets belong to a continuous distribution of super-Earth-like planets with periods ranging from the shortest known ones up to ? 30 days; their period-radius distribution is delimited against larger radii by the Neptune Desert and by the period-radius valley that separates super-Earths from sub-Neptune planets. In the abundance of small, short-periodic planets, a notable plateau has emerged between periods of 0.6- 1.4 days, which is compatible with the low-eccentricity formation channel. For the Neptune Desert, its lower limits required a revision due to the increasing population of short-period planets; for periods shorter then 2 days, we establish a radius of 1.6 R• and a mass of 0.028 Mjup (corresponding to 8.9 M•) as the desert s lower limits. We also provide corresponding limits to the Neptune Desert against the planets insolation and effective temperatures. © 2023 The Authors. |
| Keywords | Planetary systems |
| ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
| Byline Affiliations | University of California, United States |
| Centre for Astrophysics |
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https://research.usq.edu.au/item/z2598/toi-1416-a-system-with-a-super-earth-planet-with-a-1-07-d-period
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