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Asteroid Photometric Phase Functions From Bayesian Lightcurve Inversion
Muinonen, Karri; Cellino, Alberto; Wang, Xiaobin +3 more
Photometry is an important tool for characterizing the physical properties of asteroids. An asteroid's photometric lightcurve and phase curve refer to the variation of the asteroid's disk-integrated brightness in time and in phase angle (the Sun-asteroid-observer angle), respectively. They depend on the asteroid's shape, rotation, and surface scat…
Eruptions from coronal bright points: A spectroscopic view by IRIS of a mini-filament eruption, QSL reconnection, and reconnection-driven outflows
Madjarska, Maria S.; Wiegelmann, Thomas; Mackay, Duncan H. +2 more
Context. Our study investigates a mini-filament eruption associated with cancelling magnetic fluxes. The eruption originates from a small-scale loop complex commonly known as a coronal bright point (CBP). The event is uniquely recorded in both the imaging and spectroscopic data taken with the Interface Region Imaging Spectrograph (IRIS).
Aims…
A super-Earth orbiting near the inner edge of the habitable zone around the M4.5 dwarf Ross 508
Henning, Thomas; Nakagawa, Takao; Currie, Thayne +46 more
We report the near-infrared radial velocity (RV) discovery of a super-Earth planet on a 10.77 d orbit around the M4.5 dwarf Ross 508 (Jmag = 9.1). Using precision RVs from the Subaru Telescope IRD (InfraRed Doppler) instrument, we derive a semi-amplitude of $3.92^{+0.60}_{-0.58}\:\mbox{m}\:{\mbox{s}^{-1}}$, corresponding to a planet wit…
A Study of Sunspot 3 Minute Oscillations Using ALMA and GST
Yurchyshyn, Vasyl; Gary, Dale E.; Reardon, Kevin P. +1 more
Waves and oscillations are important solar phenomena, not only because they can propagate and dissipate energy in the chromosphere, but also because they carry information about the structure of the atmosphere in which they propagate. The nature of the 3 minute oscillations observed in the umbral region of sunspots is considered to be an effect of…
Combined spectroscopy and intensity interferometry to determine the distances of the blue supergiants P Cygni and Rigel
Domiciano de Souza, A.; Vakili, F.; Rivet, J. -P. +10 more
In this paper, we report on spatial intensity interferometry measurements within the Hα line on two stars: the Luminous Blue Variable supergiant P Cygni and the late-type B supergiant Rigel. The experimental setup was upgraded to allow simultaneous measurement of two polarization channels, instead of one in our previous setup, and the zero baselin…
The outermost stellar halo of NGC 5128 (Centaurus A): Radial structure
Rejkuba, M.; Greggio, L.; Crnojević, D. +2 more
Context. The extended stellar halos of galaxies contain important clues for investigating their assembly history and evolution.
Aims: We investigate the resolved stellar content and the extended halo of NGC 5128 as a function of galactocentric distance, and trace the halo outward to its currently detectable limits.
Methods: We used Hubbl…
Two New Black Widow Millisecond Pulsars in M28
Cadelano, Mario; Pallanca, Cristina; Ransom, Scott M. +18 more
We report the discovery of two Black Widow millisecond pulsars in the globular cluster (GC) M28 with the MeerKAT telescope. PSR J1824-2452M (M28M) is a 4.78 ms pulsar in a 5.82 hr orbit, and PSR J1824-2452N (M28N) is a 3.35 ms pulsar in a 4.76 hr orbit. Both pulsars have dispersion measures near 119.30 pc cm-3 and have low-mass companio…
Near-ultraviolet to visible spectroscopy of the Themis and Polana-Eulalia complex families
Tatsumi, E.; Licandro, J.; Popescu, M. +2 more
Context. Spectrophotometry data of asteroids obtained in the 1980s showed that there are large variations in their near-ultraviolet (NUV) reflectance spectra. Reflectance spectra at NUV wavelengths are important because they help detect the presence of hydrated minerals and organics on the asteroid surfaces. However, the NUV wavelength region has …
The "Maggie" filament: Physical properties of a giant atomic cloud
Schneider, N.; Klessen, R. S.; Beuther, H. +19 more
Context. The atomic phase of the interstellar medium plays a key role in the formation process of molecular clouds. Due to the line-of-sight confusion in the Galactic plane that is associated with its ubiquity, atomic hydrogen emission has been challenging to study.
Aims: We investigate the physical properties of the "Maggie" filament, a larg…
TOI-2046b, TOI-1181b, and TOI-1516b, three new hot Jupiters from TESS: planets orbiting a young star, a subgiant, and a normal star
Latham, David W.; Cochran, William D.; Endl, Michael +54 more
We present the confirmation and characterization of three hot Jupiters, TOI-1181b, TOI-1516b, and TOI-2046b, discovered by the TESS space mission. The reported hot Jupiters have orbital periods between 1.4 and 2.05 d. The masses of the three planets are 1.18 ± 0.14 MJ, 3.16 ± 0.12 MJ, and 2.30 ± 0.28 MJ, for TOI-11…