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The Variability and Radial Velocity of Planetary Nebula Central Stars
Ali, A.; Mindil, A.
The extremely accurate estimates of stellar variability and radial velocity in the Gaia Data Release 3 (Gaia DR3) have enabled us to examine the close binarity and radial velocity (RV) of central stars (CSs) of planetary nebulae (PNe). This study is twofold: (1) searching for new close binary CS candidates to better understand how binarity affects…
Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210
Milone, Antonino P.; Wang, Long; Li, Chengyuan +6 more
Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters. Therefore, searching for helium variations in a star cluster is a straightforward method to understand…
Evidence for AGN-regulated Cooling in Clusters at z 1.4: A Multiwavelength View of SPT-CL J0607-4448
Bayliss, Matthew; Kim, Keunho J.; Khullar, Gourav +9 more
We present a multiwavelength analysis of the galaxy cluster SPT-CL J0607-4448 (SPT0607), which is one of the most distant clusters discovered by the South Pole Telescope at z = 1.4010 ± 0.0028. The high-redshift cluster shows clear signs of being relaxed with well-regulated feedback from the active galactic nucleus (AGN) in the brightest cluster g…
Constraints on Europa's Water Group Torus from HST/COS Observations
Tsuchiya, Fuminori; Saur, Joachim; Roth, Lorenz +8 more
In situ plasma measurements as well as remote mapping of energetic neutral atoms around Jupiter provide indirect evidence that an enhancement of neutral gas is present near the orbit of the moon Europa. Simulations suggest that such a neutral gas torus can be sustained by escape from Europa's atmosphere and consists primarily of molecular hydrogen…
Modelling the variable emission states of γ-ray-emitting narrow-line Seyfert 1 galaxies
Luashvili, Anna; Boisson, Catherine; Zech, Andreas +2 more
γ-ray-emitting narrow-line Seyfert 1 galaxies (γ-NLS1) constitute an intriguing small population of active galactic nuclei with γ-ray emission resembling low-power flat-spectrum radio quasars (FSRQ), but with differing physical properties. They are jetted, γ/radio-loud Seyfert galaxies, with relatively low black hole masses, accreting at exception…
Residual gas damping noise in constrained volume in space-borne gravitational wave detection
Luo, Jie; Tan, Yu-Jie; Shao, Cheng-Gang +4 more
The residual gas damping in the enclosure surrounding a free-fall test mass is an important limiting factor for the sensitivity of some space detection missions. We present a constrained volume damping model for space-borne gravitational wave detection, which depends on the escape time needed for a molecule to diffuse out of the gap between two ad…
Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752
Pilachowski, Catherine A.; Deliyannis, Constantine P.; Shetrone, Matthew D. +8 more
We present analyses of improved photometric and spectroscopic observations for two detached eclipsing binaries at the turnoff of the open cluster NGC 752: the 1.01 days binary DS And and the 15.53 days BD +37 410. For DS And, we find M 1 = 1.692 ± 0.004 ± 0.010M ⊙, R 1 = 2.185 ± 0.004 ± 0.008R ⊙, M …
Eta Carinae: The Dissipating Occulter Is an Extended Structure
Hamaguchi, Kenji; Corcoran, Michael F.; Moffat, Anthony F. J. +11 more
Previous Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) longslit observations of Eta Carinae (η Car) identified numerous absorption features in both the stellar spectrum, and in the adjacent nebular spectra, along our line of sight (LOS). The absorption features became temporarily stronger when the ionizing far-ultraviole…
Far-infrared polarization of the supernova remnant Cassiopeia A with SOFIA HAWC +
Hoang, Thiem; Kirchschlager, Florian; Tram, Le Ngoc +8 more
We present polarization observations of the young supernova remnant (SNR) Cas A using the High-resolution Airborne Wideband Camera-Plus (HAWC +) instrument onboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The polarization map at 154 $\mu$m reveals dust grains with strong polarization fractions (5-30 per cent), supporting previ…
Constraining Young Hot Jupiter Occurrence Rate in Stellar Associations Using 2-min Cadence TESS Data
Ma, Bo; Fang, Yuanqing; Chen, Chen +1 more
The characterization of young planet distribution is essential for our understanding of the early evolution of exoplanets. Here we conduct a systematic search for young planets from young open clusters and associations using the 2-min cadence TESS survey data. We obtain TESS light curves for a total of 1075 young stars, which are selected with the…