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Observations with the Differential Speckle Survey Instrument. XI. First Year of Observations from Apache Point Observatory
Majewski, Steven R.; Henry, Todd J.; Chanover, Nancy J. +18 more
The Differential Speckle Survey Instrument (DSSI) was relocated to the Astrophysical Research Consortium 3.5 m telescope at Apache Point Observatory (APO) in early 2022. Here we present results from the first year of observations along with an updated instrument description for DSSI at APO, including a detailed description of a new internal slit m…
Systematic KMTNet Planetary Anomaly Search. X. Complete Sample of 2017 Prime-field Planets
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +42 more
We complete the analysis of planetary candidates found by the KMT AnomalyFinder for the 2017 prime fields that cover ∼13 deg2. We report three unambiguous planets: OGLE-2017-BLG-0640, OGLE-2017-BLG-1275, and OGLE-2017-BLG-1237. The first two of these were not previously identified, while the last was not previously published due to tech…
Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems
Rice, Malena; Wang, Songhu; Wang, Xian-Yu +5 more
Despite decades of effort, the mechanisms by which the spin axis of a star and the orbital axes of its planets become misaligned remain elusive. In particular, it is of great interest whether the large spin–orbit misalignments observed are driven primarily by high-eccentricity migration—expected to have occurred for short-period, isolated planets—…
Modeling JWST MIRI-MRS Observations of T Cha: Mid-IR Noble Gas Emission Tracing a Dense Disk Wind
Pascucci, Ilaria; Gorti, Uma; Clarke, Cathie J. +8 more
[Ne II] 12.81 µm emission is a well-used tracer of protoplanetary disk winds due to its blueshifted line profile. Mid-Infrared Instrument (MIRI)-Medium Resolution Spectrometer (MRS) recently observed T Cha, detecting this line along with lines of [Ne III], [Ar II], and [Ar III], with the [Ne II] and [Ne III] lines found to be extended while …
iSLAT: the Interactive Spectral-line Analysis Tool for JWST and Beyond
Banzatti, Andrea; Bruderer, Simon; Jellison, Evan G. +1 more
We present the Interactive Spectral-Line Analysis Tool (iSLAT), a python-based graphical tool that allows users to interactively explore, inspect, and fit line emission observed in molecular spectra. iSLAT adopts a simple slab model in LTE that simulates emission spectra with a small set of parameters (temperature, emitting area, column density, a…
JWST COMPASS: The 3–5 µm Transmission Spectrum of the Super-Earth L 98-59 c
Batalha, Natalie M.; Moran, Sarah E.; Kirk, James +14 more
We present a JWST Near-InfraRed Spectrograph (NIRSpec) transmission spectrum of the super-Earth exoplanet L 98-59 c. This small (R p = 1.385 ± 0.085R ⊕, M p = 2.22 ± 0.26 R ⊕), warm (T eq = 553 K) planet resides in a multiplanet system around a nearby, bright (J = 7.933) M3V star. We find …
89 New Ultracool Dwarf Comoving Companions Identified with the Backyard Worlds: Planet 9 Citizen Science Project
Meisner, Aaron M.; Cushing, Michael C.; Kirkpatrick, J. Davy +43 more
We report the identification of 89 new systems containing ultracool dwarf companions to main-sequence stars and white dwarfs, using the citizen science project Backyard Worlds: Planet 9 and cross-reference between Gaia and CatWISE2020. 32 of these companions and 33 host stars were followed up with spectroscopic observations, with companion spectra…
A Formally Motivated Retrieval Framework Applied to the High-resolution Transmission Spectrum of HD 189733 b
Blain, Doriann; Sánchez-López, Alejandro; Mollière, Paul
Ground-based high-resolution spectra provide a powerful tool for characterizing exoplanet atmospheres. However, they are greatly hampered by the dominating telluric and stellar lines, which need to be removed prior to any analysis. Such removal techniques ("preparing pipelines") deform the spectrum; hence, a key point is to account for this proces…
Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-velocity Characterization
Gromadzki, M.; Huang, Yang; Liu, Chang +50 more
We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with at a projected orbital separation au, and the host is a ∼1.1 M ⊙ turnoff star at ∼1.3 kpc. At , the…
DIAmante TESS AutoRegressive Planet Search (DTARPS). II. Hundreds of New TESS Candidate Exoplanets
Feigelson, Eric D.; Montalto, Marco; Melton, Elizabeth J. +3 more
The DIAmante TESS AutoRegressive Planet Search for the southern ecliptic hemisphere (DTARPS-S) project seeks to identify photometric transiting planets from 976,814 southern hemisphere stars observed in Year 1 of the TESS mission. This paper follows the methodology developed by Melton et al. (Paper I) using light curves extracted and preprocessed …