Search Publications
HIP 67506 C: MagAO-X confirmation of a new low-mass stellar companion to HIP 67506 A
Weinberger, Alycia J.; Guyon, Olivier; Close, Laird M. +17 more
We report the confirmation of HIP 67506 C, a new stellar companion to HIP 67506 A. We previously reported a candidate signal at 2λ/D (240 mas) in L' in MagAO/Clio imaging using the binary differential imaging technique. Several additional indirect signals showed that the candidate signal merited follow-up: significant astrometric accele…
Search strategies for supermassive stars in young clusters and application to nearby galaxies
Schaerer, D.; Marques-Chaves, R.; Usher, C. +4 more
Context. Supermassive stars (SMSs) with masses M ≳ 103 − 104 M⊙ formed by runaway collisions in young, massive, and dense star clusters have been invoked as a possible solution to the problem of the presence of multiple stellar populations and peculiar abundance patterns observed in globular clusters (GCs). However…
Langmuir waves associated with magnetic holes in the solar wind
André, M.; Maksimovic, M.; Souček, J. +6 more
Context. Langmuir waves (electrostatic waves near the electron plasma frequency) are often observed in the solar wind and may play a role in the energy dissipation of electrons. The largest amplitude Langmuir waves are typically associated with type II and III solar radio bursts and planetary foreshocks. In addition, Langmuir waves not related to …
A Search for Stellar Siblings of the 200 Myr TOI-251 b Planetary System
Kraus, Adam L.; Barber, Madyson G.; Mann, Andrew W. +4 more
Young planets (<1 Gyr) are helpful for studying the physical processes occurring at the early stage of planet evolution. TOI-251 b is a recently discovered sub-Neptune orbiting a young G dwarf, which has an imprecise age estimation of 40-320 Myr. We select TOI-251 sibling candidates based on kinematics and spatial proximity to TOI-251 and furth…
Güneş Civarındaki Metalce Fakir Yıldızların SED Yöntemiyle Temel Astrofizik Parametrelerinin Tayini
Çınar, Deniz Cennet; Bilir, Selçuk; Şahin, Timur +2 more
Bu çalışmada, Güneş civarından seçilmiş metalce fakir yıldızların tayfsal enerji dağılımları (SED) analiz edilmiş ve teorik olarak hesaplanan model atmosfer fitleriyle, yıldızların tayfsal analizlerinde kullanılabilecek öncül temel astrofizik parametreler tayin edilmiştir. Bu amaç doğrultusunda Polarbase veri tabanı ve ELODIE tayf kütüphanesinden …
An investigation into the effect of exposing XMM-Newton's Optical Monitor to the light of Jupiter
Sullivan, S; Page, M J; Breeveld, A A +2 more
After nearly 18 yr of successful and safe operations, on 2017 July 17 and 18, XMM-Newton's Optical Monitor (OM) observed Jupiter - an object 10 magnitudes brighter than safe brightness limits - in its visual (V) filter. The object was exposed 40 arcsec from the nominal European Photon Imaging Cameras pn boresight in the negative Y direction, creat…
Sapaki: Galactic O3If* star possibly born in isolation
Roman-Lopes, A.; Sanmartim, D.; Zarricueta Plaza, M. S.
Context. The study of high-mass stars found to be isolated in the field of the Milky Way may help to probe the feasibility of the core-accretion mechanism in the case of massive star formation. The existence of truly isolated stars may efficiently probe the possibility that individual massive stars can be born in isolation.
Aims: We observed …
Search of Exoplanets in steLLar streAms (SELLA)
Castro-González, A.; Díez Alonso, E.; Iglesias Álvarez, S. +3 more
In this work we search and characterize exoplanets orbiting members of stellar streams, structures in the Galaxy composed of stars with similar dynamic and chemical properties, and with galactic or extragalactic origin. With current facilities, the detection of exoplanets in extragalactic stellar streams, resulting from merger events, could be the…
The JCMT nearby galaxies legacy survey: SCUBA-2 observations of nearby galaxies
Pattle, Kate; Gear, Walter; Wilson, Christine D.
We present 850 $\mu$m observations of a sample of 8 nearby spiral galaxies, made using the SCUBA-2 camera on the James Clerk Maxwell Telescope (JCMT) as part of the JCMT Nearby Galaxies Legacy Survey (NGLS). We corrected our data for the presence of the 12CO J = 3 → 2 line in the SCUBA-2 850 $\mu$m bandwidth using NGLS HARP data, findin…
Full-frame Data Reduction Method: A Data Mining Tool to Detect the Potential Variations in Optical Photometry
Zhou, Hao; Dai, Zhi-Bin; Cao, Jin
A Synchronous Photometry Data Extraction (SPDE) program, performing indiscriminate monitoring of all stars appearing in the same field of view of an astronomical image, is developed by integrating several Astropy affiliated packages to make full use of time series observed by traditional small/medium aperture ground-based telescopes. The complete …