Search Publications
Volatile-rich Sub-Neptunes as Hydrothermal Worlds: The Case of K2-18 b
Fortney, Jonathan J.; Moses, Julianne I.; Zhang, Xi +8 more
Temperate exoplanets between the sizes of Earth and Neptune, known as "sub-Neptunes," have emerged as intriguing targets for astrobiology. It is unknown whether these planets resemble Earth-like terrestrial worlds with a habitable surface, Neptune-like giant planets with deep atmospheres and no habitable surface, or something exotic in between. Re…
Observational Properties of 155 β Cephei Pulsating Variable Stars
Shi, Xiang-dong; Qian, Sheng-bang; Zhu, Li-ying +3 more
β Cephei pulsating variable (BCEP) stars are the most massive pulsating variable stars in the main sequence, exhibiting both p- and g-mode pulsations. In this study, we identified 155 BCEP stars or candidates using data from TESS and Gaia, of which 83 were first confirmed as BCEP stars. They have visual magnitudes ranging from 8 to 12 mag and effe…
Revisiting empirical solar energetic particle scaling relations: II. Coronal mass ejections
Veronig, Astrid M.; Papaioannou, Athanasios; Herbst, Konstantin +2 more
Aims. The space radiation environment conditions and the maximum expected coronal mass ejection (CME) speed are assessed by investigating scaling laws between the peak proton flux and fluence of solar energetic particle (SEP) events with the speed of the CMEs. Methods. We used a complete catalog of SEP events, covering the last ∼25 years of CME ob…
Illuminating evaporating protostellar outflows: ERIS/SPIFFIER reveals the dissociation and ionization of HH 900
Reiter, Megan; Manara, Carlo F.; Ramsay, Suzanne +4 more
Protostellar jets and outflows are signposts of active star formation. In H II regions, molecular tracers like CO only reveal embedded portions of the outflow. Outside the natal cloud, outflows are dissociated, ionized, and eventually completely ablated, leaving behind only the high-density jet core. Before this process is complete, there should b…
Stellar model tests and age determination for RGB stars from the APO-K2 catalogue
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +1 more
Aims. By adopting the recently empirically derived dependence of α-elements on [α/Fe] instead of the conventionally applied uniform one, we tested the agreement between stellar model predictions and observations for red giant branch (RGB) stars in the APO-K2 catalogue. We particularly focused on the biases in effective temperature scales and on th…
A long-term study of the magnetic field and activity in the M giant RZ Ari. Magnetism and planet engulfment in a fairly evolved star?
Mathias, P.; Zamanov, R.; Baron, F. +12 more
Aims: We present a detailed long-term study of the single M6 III giant RZ Ari to obtain direct and simultaneous measurements of the magnetic field, activity indicators, and radial velocity in order to infer the origin of its activity. We study its magnetic activity in the context of stellar evolution, and for this purpose, we also refined its…
JWST/NIRSpec spectroscopy of intermediate-mass quiescent galaxies at z 3-4
Harikane, Yuichi; Inoue, Akio K.; Hashimoto, Takuya +9 more
We present the analysis of three intermediate-mass quiescent galaxies (QGs) with stellar masses of
Dual-band Observations of the Asymmetric Ring around CIDA 9A: Dead or Alive?
Herczeg, Gregory J.; Johnstone, Doug; Long, Feng +9 more
While the most exciting explanation of the observed dust asymmetries in protoplanetary disks is the presence of protoplanets, other mechanisms can also form the dust features. This paper presents dual-wavelength Atacama Large Millimeter/submillimeter Array observations of a large asymmetric dusty ring around the M-type star CIDA 9A. We detect a du…
XMM-Newton - NuSTAR monitoring campaign of the Seyfert 1 galaxy IC 4329A
Paltani, S.; Tombesi, F.; Privon, G. C. +13 more
We present the results of a joint XMM-Newton and NuSTAR campaign on the active galactic nucleus (AGN) IC 4329A, consisting of 9 × 20 ks XMM-Newton observations, and 5 × 20 ks NuSTAR observations within nine days, performed in August 2021. Within each observation, the AGN is not very variable, and the fractional variability never exceeds 5%. Flux v…
Eight new 2+2 doubly eclipsing quadruple systems detected
Merc, J.; Kučáková, H.; Zasche, P. +2 more
We studied eight new doubly eclipsing stellar systems. We found that they are all rare examples of quadruple systems of 2 + 2 architecture, where both inner pairs are eclipsing binaries. Until now, such a configuration had only been proven for dozens of systems on the whole sky. We enlarged this rare group of systems with four stars in the Small M…