Search Publications
Halfway to the Peak: Spatially Resolved Star Formation and Kinematics in a z = 0.54 Dusty Galaxy with JWST/MIRI
Veilleux, Sylvain; Ogle, Patrick; Alberts, Stacey +16 more
We present JWST Mid-InfraRed Instrument/Medium-Resolution Spectrometer (MIRI/MRS) observations of an infrared luminous disk galaxy, FLS1, at z ~ 0.54. With a lookback time of 5 Gyr, FLS1 is chronologically at the midpoint between the peak epoch of star formation and the present day. The MRS data provide maps of the atomic fine structure lines [Ar …
Separated Twins or Just Siblings? A Multiplanet System around an M Dwarf Including a Cool Sub-Neptune
Quinn, Samuel N.; Stassun, Keivan G.; Zhou, George +27 more
We report the discovery of two TESS sub-Neptunes orbiting the early M dwarf TOI-904 (TIC 261257684). Both exoplanets, TOI-904 b and c, were initially observed in TESS Sector 12 with twin sizes of ${2.426}_{-0.157}^{+0.163}$ and ${2.167}_{-0.118}^{+0.130}$ R ⊕, respectively. Through observations in five additional sectors in the TESS pri…
Orbits and Masses of the Small Satellites of Pluto
Porter, Simon B.; Canup, Robin M.
We present a new orbit and mass solution for the four small satellites of Pluto: Styx, Nix, Kerberos, and Hydra. We have reanalyzed all available observations of the Pluto system obtained by the Hubble Space Telescope from 2005 to 2019 with the ACS, WFPC2, and WFC3 instruments, as well as the New Horizons LORRI images taken on approach to Pluto in…
Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Liu, N.; Zhu, Z.; Liu, J. -C. +3 more
Context. Pulsars are special objects whose positions can be determined independently from timing, radio interferometric, and Gaia astrometry at sub-milliarcsecond (mas) precision; thus, they provide a unique way to monitor the link between dynamical and kinematic reference frames.
Aims: We aim to assess the orientation consistency between the…
Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b
Smalley, Barry; Triaud, Amaury H. M. J.; Law, Nicholas M. +62 more
While the sample of confirmed exoplanets continues to grow, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stellar masses and study the impact of high irradiation on hot Jupiters orbiting such stars. We report …
LISC Catalog of Open Clusters III. 83 Newly Found Galactic Disk Open Clusters Using Gaia EDR3
Wang, Feng; Li, Zhongmu; Chi, Huanbin
As groups of coeval stars born from the same molecular cloud, an open cluster (OC) is an ideal laboratory for studying the structure and dynamical evolution of the Milky Way. The release of high-precision Gaia Early Data Release 3 (Gaia EDR3) and modern machine-learning methods offer unprecedented opportunities to identify OCs. In this study, we e…
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Characterization of the young star T CrA and its circumstellar environment
Lodato, G.; Ménard, F.; Ginski, C. +15 more
Context. In recent years, a new hot topic has emerged in the star and planet formation field, namely, the interaction between the circumstellar disk and its birth cloud. The birth environments of young stars leave strong imprints on the star itself and their surroundings. In this context, we present a detailed analysis of the rich circumstellar en…
The spectroscopic orbit of Polaris and its pulsation properties
Torres, Guillermo
Polaris is the nearest and brightest classical Cepheid, and pulsates with a period of about 4 d. It has long been known as a single-lined spectroscopic binary with an orbital period of 30 yr. Historical photometric and spectroscopic records indicate that, until recently, the pulsation period has been increasing at a rate of about 4.5 s yr-1
KDG 64: a large dwarf spheroidal or a small ultradiffuse satellite of Messier 81
Caldwell, Nelson; Makarova, Lidia; Makarov, Dmitry +5 more
Low-mass early-type galaxies, including dwarf spheroidals (dSph) and brighter dwarf ellipticals (dE), dominate the galaxy population in groups and clusters. Recently, an additional early-type population of more extended ultradiffuse galaxies (UDGs) has been identified, sparking a discussion on the potential morphological and evolutionary connectio…
Light Curve Analysis of the AP Dor Binary System using Ground-based and TESS Observations
Poro, A.; Fernández-Lajús, E.; Madani, M. +3 more
The short-period eclipsing binary AP Dor's first in-depth and multiband photometric solutions are presented. We made use of our eight nights of ground-based opportunity at a southern hemisphere observatory, and twelve sectors of TESS observations. We extracted eight and 1322 minima from our observations and TESS, respectively. We suggest a new lin…