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Improving Planet Detection with Disk Modeling: Keck/NIRC2 Imaging of the HD 34282 Single-armed Protoplanetary Disk
Dong, Ruobing; Millar-Blanchaer, Maxwell A.; Wallack, Nicole L. +5 more
Formed in protoplanetary disks around young stars, giant planets can leave observational features such as spirals and gaps in their natal disks through planet-disk interactions. Although such features can indicate the existence of giant planets, protoplanetary disk signals can overwhelm the innate luminosity of planets. Therefore, in order to imag…
Breaking Correlation in the Inflow Parameters of Interstellar Neutral Gas in Direct-sampling Observations
Möbius, E.; Schwadron, N. A.; Bzowski, M. +1 more
We analyze the reasons for the correlation between the temperature, direction, and speed of the interstellar neutral gas inflow into the heliosphere, obtained in analyses of observations performed by an onboard Interstellar Boundary Explorer (IBEX) instrument, IBEX-Lo. We point out that this correlation is the combined result of the inability to m…
Surface Properties of Near-Sun Asteroids
Richardson, Derek C.; Sunshine, Jessica M.; Hsieh, Henry H. +8 more
Near-Earth asteroids (NEAs) with small perihelion distances reach subsolar temperatures of ≥1000 K. They are hypothesized to undergo "supercatastrophic" disruption, potentially caused by near-Sun processes such as thermal cracking, spin-up, meteoroid impacts, and subsurface volatile release, all of which are likely to cause surface alteration, whi…
Radio properties of the OH megamaser galaxy IIZw 096
Chen, Xi; Zhang, Bo; Wu, Hong +9 more
Based on the two-epoch European Very Long Baseline Interferometry (VLBI) Network (EVN) archive data from OH line observations of IIZw 096, we confirm that the high-resolution OH emission in this source mainly comes from two spots (OH1 and OH2) of component (comp) D1 of this merging system. We found no significant variations in the OH 1667 MHz line…
Taxonomy of protoplanetary discs observed with ALMA
Ward-Thompson, Derek; Kirk, Jason; Parker, Raeesa
Many observations of protoplanetary discs studied with ALMA have revealed the complex substructure present in the discs. Rings and gaps in the dust continuum are now a common sight in many discs; however, their origins still remain unknown. We look at all protoplanetary disc images taken with ALMA from cycles 0 to 5 and find that 56 discs show cle…
Twelve-Year Cycle in the Cloud Top Winds Derived from VMC/Venus Express and UVI/Akatsuki Imaging
Titov, Dmitrij V.; Ignatiev, Nikolay I.; Khatuntsev, Igor V. +3 more
We present joint analysis of the UV (365 nm) images captured by the cameras on board ESA's Venus Express and JAXA's Akatsuki spacecraft. These observations enabled almost continuous characterization of the cloud top circulation over the longest period of time so far (2006-2021). More than 46,000 wind vectors were derived from tracking the UV cloud…
A highly mutually inclined compact warm-Jupiter system KOI-984?
Schmitt, J. H. M. M.; Czesla, S.; Wang, X. +6 more
The discovery of a population of close-orbiting giant planets (≤ 1 au) has raised a number of questions about their origins and dynamical histories. These issues have still not been fully resolved, despite over 20 years of exoplanet detections and a large number of discovered exoplanets. In particular, it is unclear whether warm Jupiters (WJs) for…
3D mapping of the Wolf-Rayet nebula M 1-67: clues for post-common envelope evolution in massive stars
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +5 more
We present a 3D mapping of the Wolf-Rayet (WR) nebula M 1-67 around WR 124. We obtained high-resolution San Pedro Mártir (SPM) Manchester Echelle Spectrograph (MES) observations along 17 long-slit positions covering all morphological features in M 1-67. We are able to unveil the true morphology of M 1-67 and its kinematics by interpreting the SPM …
WDPhotTools - a white dwarf photometric toolkit in Python
Green, M. J.; Li, W.; Lam, M. C. +1 more
From data collection to photometric fitting and analysis of white dwarfs, to generating a white dwarf luminosity function requires numerous astrophysical, mathematical, and computational domain knowledge. The steep learning curve makes it difficult to enter the field, and often individuals have to reinvent the wheel to perform identical data reduc…
Two evolved close binary stars: GALEX J015054.4+310745 and the central star of the planetary nebula Hen 2-84
Reindl, Nicole; Irrgang, Andreas; Heber, Ulrich +3 more
As part of a survey to find close binary systems among central stars of planetary nebula, we present two newly discovered binary systems. GALEX J015054.4+310745 is identified as the central star of the possible planetary nebula Fr 2-22. We find it to be a single-lined spectroscopic binary with an orbital period of 0.2554435(10) d. We support the p…