Search Publications
CHIMERA Occultation Constraints on the Abundance of Kilometer-scale Kuiper Belt Objects
Zhang, Qicheng; Saini, Navtej S.; Hallinan, Gregg W. +3 more
Occultations provide indirect sensitivity to the number density of small Kuiper Belt objects (KBOs) too faint to directly detect telescopically. We present results from the Caltech HI-speed Multicolor camERA (CHIMERA) survey with the Palomar Hale Telescope, which monitored stars over the central $5^{\prime} \times 5^{\prime} $ of the M22 globular …
RR Lyrae Stars in the Globular Cluster Palomar 2
Arellano Ferro, A.; Muneer, S.; Bustos Fierro, I. +1 more
A CCD VI imaging time-series over 11-year is employed to explore the light curves of stars in the field of Palomar 2. We discovered 20 RRab and 1 RRc variables. A revision of Gaia-DR3 data enabled us to identify 10 more variables and confirm the RRab nature of 6 of them and one RGB. The cluster membership is discussed, and 18 variables are most li…
Tidal disruption events and quasi‑periodic eruptions
Lin, Dacheng; Godet, Olivier; Webb, Natalie A. +4 more
Tidal disruption events (TDEs) occur when a star passes close to a massive black hole so that the tidal forces of the black hole exceed the binding energy of a star and cause it to be ripped apart. Part of the matter will fall onto the black hole, causing a strong increase in luminosity. Such events are often seen in the optical or the x‑ray (or b…
Cosmic-ray-driven enhancement of the C0/CO abundance ratio in W 51 C
Yamagishi, Mitsuyoshi; Kaneda, Hidehiro; Shimonishi, Takashi +5 more
We examine spatial variations of the C0$/$CO abundance ratio (XC/CO) in the vicinity of the γ-ray supernova remnant W 51 C, based on [C I] (3P1-3P0), 12CO(1-0), and 13CO(1-0) observations with the ASTE and Nobeyama 45 m telescopes. We find that XC/CO…
The equilibrium shape of (65) Cybele: primordial or relic of a large impact?
Jorda, L.; Carry, B.; Molina, D. +24 more
Context. Cybele asteroids constitute an appealing reservoir of primitive material genetically linked to the outer Solar System, and the physical properties (size and shape) of the largest members can be readily accessed by large (8m class) telescopes.
Aims: We took advantage of the bright apparition of the most iconic member of the Cybele pop…
Stellar angular momentum of disk galaxies at z ≈ 0.7 in the MAGIC survey. I. Impact of the environment
Ciesla, L.; Krajnović, D.; Lemaux, B. C. +6 more
Aims: At intermediate redshift, galaxy groups and clusters are thought to impact galaxy properties such as their angular momentum. We investigate whether the environment has an impact on the galaxies' stellar angular momentum and identify underlying driving physical mechanisms.
Methods: We derived robust estimates of the stellar angular …
New Insights into Variations in Enceladus Plume Particle Launch Velocities from Cassini-VIMS Spectral Data
Hedman, M. M.; Sharma, H.; Vahidinia, S.
Enceladus's plume consists mainly of a mixture of water vapor and solid ice particles that may originate from a subsurface ocean. The physical processes underlying Enceladus's plume particle dynamics are still being debated, and quantifying the particles' size distribution and launch velocities can help constrain these processes. Cassini's Visual …
Comparative analysis of photometric parameters over Apollo landing sites from Terrain Mapping Camera (Chandrayaan-1/2) and lab measured data
Arya, A. S.; Nagori, Rohit; Dagar, Aditya K.
Terrain Mapping Camera (TMC) onboard Chandrayaan-1/2 have provided high spatial resolution (∼5m) panchromatic images in three stereo-views of fore, nadir and aft, (-25⁰, 0⁰, 25⁰), respectively. This study presents the comparative analysis of photometric properties in visible domain from TMC and lab measured data over Apollo 11, 12, 16 and 17 landi…
PEARLS: Near-infrared Photometry in the JWST North Ecliptic Pole Time Domain Field
Grogin, Norman A.; Koekemoer, Anton M.; Smail, Ian +23 more
We present near-infrared (NIR) ground-based Y, J, H, and K imaging obtained in the James Webb Space Telescope (JWST) North Ecliptic Pole Time Domain Field (NEP TDF) using the MMT-Magellan Infrared Imager and Spectrometer on the MMT. These new observations cover a field of approximately 230 arcmin2 in Y, H, and K, and 313 arcmin2
Searching for the nature of stars with debris disks and planets
Cifuentes, C.; Cruz, P.; Roca-Fàbrega, S. +3 more
The nature of the few known solar-mass stars simultaneously containing debris disks and planets remains an open question. A number of works have shown that this property appears to be independent of planetary masses as well as of stellar age, but possible correlations with stellar kinematics and metallicity have not been investigated. In this pape…