Search Publications
Search for exoplanets around northern circumpolar stars. V. Three likely planetary companions to the giant stars HD 19615, HD 150010, and HD 174205
Jeong, G.; Lee, B. -C.; Park, M. -G. +2 more
Aims: We report the detection of long-period radial velocity (RV) variations in three giant stars, HD 19615, HD 150010, and HD 174205, using precise RV measurements.
Methods: These detections are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS) survey being conducted at the Bohyunsan Optical Astronomy Observator…
IRIS burst properties in active regions
Kleint, L.; Nelson, C. J.
Context. Interface Region Imaging Spectrograph (IRIS) bursts are localised features thought to be driven by magnetic reconnection. Although these events are well-studied, it remains unknown whether their properties vary as their host active regions (ARs) evolve.
Aims: In this article, we aim to understand whether the measurable properties (e.…
Toward measuring the spin of obscured supermassive black holes. A critical assessment with disk megamasers
Celotti, Annalisa; Masini, Alberto; Campitiello, Samuele
Context. Mass and spin are two fundamental properties of astrophysical black holes. While some established indirect methods are adopted to measure both these properties of active galactic nuclei (AGN) when viewed relatively face-on, very few suggested methods exist to measure these properties when AGN are highly inclined and potentially obscured b…
Optical microflares in LS I +61 303 and the search for their multiwavelength counterpart
Luque-Escamilla, Pedro L.; Martí, Josep; del Ser, Daniel +4 more
Context. Stellar sources of gamma rays are one of the front lines in modern astrophysics whose understanding can benefit from observational tools not originally designed for their study.
Aims: We take advantage of the high precision photometric capabilities of present-day space facilities to obtain a new perspective on the optical behavior of…
ArTéMiS imaging of the filamentary infrared dark clouds G1.75-0.08 and G11.36+0.80: Dust-based physical properties of the clouds and their clumps
André, Ph.; Miettinen, O.; Mattern, M.
Context. Filamentary infrared dark clouds (IRDCs) are a useful class of interstellar clouds for studying the cloud fragmentation mechanisms on different spatial scales. Determination of the physical properties of the substructures in IRDCs can also provide useful constraints on the initial conditions and early stages of star formation, including t…
Near-IR narrow-band imaging with CIRCE at the Gran Telescopio Canarias: Searching for Lyα-emitters at z ∼ 9.3
Mas-Hesse, J. M.; Herrero, A.; Marín-Franch, A. +8 more
Context. Identifying very high-redshift galaxies is crucial for understanding the formation and evolution of galaxies. However, many questions still remain, and the uncertainty on the epoch of reionization is large. In this approach, some models allow a double-reionization scenario, although the number of confirmed detections at very high z is sti…
The symbiotic binary St 2-22: Orbital and stellar parameters and jet evolution following its 2019 outburst
Mikołajewska, J.; Iłkiewicz, K.; Monard, B. +3 more
Context. St 2-22 is a relatively poorly studied S-type symbiotic system that belongs to a small group of jet-producing systems as a result of disc accretion onto a white dwarf fed by its red giant companion.
Aims: The goal of this paper is to analyse the nature and derive the basic parameters of St 2-22, and to follow the jet evolution.
…
K2 discovery of a circumsecondary disk transiting EPIC 220208795
Mamajek, E. E.; Kenworthy, M. A.; Pojmański, G. +2 more
Context. Observations of the star EPIC 220208795 (2MASS J01105556+0018507) reveal a single, deep and asymmetric eclipse, which we hypothesise is due to an eclipsing companion surrounded by a tilted and inclined opaque disk, similar to those seen around V928 Tau and EPIC 204376071.
Aims: We aim to derive physical parameters of the disk and orb…
Extended population associated with W40
Comerón, F.; Schneider, N.; Djupvik, A. A.
Context. W40 is a heavily obscured bipolar HII region projected in the direction of the Aquila Rift and ionized by hot stars in a central, partly embedded cluster. The study of the cluster and its surroundings has been greatly hampered thus far by the strong extinction in the region.
Aims: Our aim is to improve the characterization of the W40…
Abundances of disk and bulge giants from high-resolution optical spectra. V. Molybdenum: The p-process element
Ryde, N.; Rich, R. M.; Jönsson, H. +2 more
Aims: In this work, we aim to make a differential comparison of the neutron-capture and p-process element molybdenum (Mo) in the stellar populations in the local disk(s) and the bulge, focusing on minimising possible systematic effects in the analysis.
Methods: The stellar sample consists of 45 bulge and 291 local disk K-giants observed …