|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
18 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
HD 191939: Three Sub-Neptunes Transiting a Sun-like Star Only 54 pc Away | | Mariona Badenas-Agusti
; Maximilian N. Günther
; Tansu Daylan
; Thomas Mikal-Evans
; Andrew Vanderburg
; Chelsea X. Huang
; Elisabeth Matthews
; Benjamin V. Rackham
; Allyson Bieryla
; Keivan G. Stassun
; Stephen R. Kane
; Avi Shporer
; Benjamin J. Fulton
; Michelle L. Hill
; Grzegorz Nowak
; Ignasi Ribas
; Enric Pallé
; Jon M. Jenkins
; David W. Latham
; Sara Seager
; George R. Ricker
; Roland K. Vanderspek
; Joshua N. Winn
; Oriol Abril-Pla
; Karen A. Collins
; Pere Guerra Serra
; Prajwal Niraula
; Zafar Rustamkulov
; Thomas Barclay
; Ian J. M. Crossfield
; Steve B. Howell
; David R. Ciardi
; Erica J. Gonzales
; Joshua E. Schlieder
; Douglas A. Caldwell
; Michael Fausnaugh
; Scott McDermott
; Martin Paegert
; Joshua Pepper
; Mark E. Rose
; Joseph D. Twicken
; | | Date: |
10 Feb 2020 | | Abstract: | We present the discovery of three sub-Neptune-sized planets transiting the
nearby and bright Sun-like star HD 191939 (TIC 269701147, TOI 1339), a
$K_{s}=7.18$ magnitude G8V dwarf at a distance of only 54 parsecs. This
multi-planetary system is one of the best candidates for atmospheric
characterization to date, with all its known planets suitable for
multi-wavelength transmission spectroscopy. We validate the planetary nature of
the transit signals by combining five months of data from the Transiting
Exoplanet Survey Satellite with follow-up ground-based photometry, archival
optical images, radial velocities, and high angular resolution observations.
The three sub-Neptunes have similar radii ($R_{b} =
3.37^{+0.13}_{-0.13},R_{oplus}$, $R_{c}=3.22_{-0.14}^{+0.15},R_{oplus}$,
and $R_{d}=3.16_{-0.11}^{+0.11},R_{oplus}$) and their orbits are consistent
with a stable, circular, and co-planar architecture near mean motion resonances
of 1:3 and 3:4 ($P_{b}=8.88$ days, $P_{c}=28.58$ days, and $P_{d}=38.35$ days).
The HD 191939 system is an excellent candidate for precise mass determinations
of the planets with high-resolution spectroscopy due to the host star’s
brightness and low chromospheric activity. Moreover, the system’s compact and
near-resonant nature can provide an independent way to measure planetary masses
via transit timing variations while also enabling dynamical and evolutionary
studies. Finally, as a prime target for transmission spectroscopy of all three
planets’ atmospheres, HD 191939 can offer a unique insight into multiple
sub-Neptunes born from a proto-planetary disk that may have resembled that of
the early Sun. | | Source: | arXiv, 2002.3958 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER