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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 …
Initial On-Sky Performance Testing of the Single-Photon Imager for Nanosecond Astrophysics (SPINA) System
Smoot, George F.; Lau, Albert Wai Kit; Shaimoldin, Nurzhan +4 more
This work presents an initial on-sky performance measurement of the Single-Photon Imager for Nanosecond Astrophysics (SPINA) system, part of our Ultra-Fast Astronomy (UFA) program. We developed the SPINA system based on the position-sensitive silicon photomultiplier (PS-SiPM) detector to record both photoelectron (P.E.) temporal and spatial inform…
How Hot Can Small Solar Flares Get?
Krucker, Säm; Reeves, Katharine K.; Barczynski, Krzysztof +4 more
The temperature reached by solar flares is a key parameter to understanding the physical process that causes the energy release. In this work, we analysed data from a Hinode Observing Programme that focused on high cadence measurement of the flaring plasma. This was carried out when the X-ray imager and spectrometer (STIX) on Solar Orbiter was obs…
Correction to: Spectroscopic follow-up of black hole and neutron star candidates in ellipsoidal variables from Gaia DR3
El-Badry, Kareem; Nagarajan, Pranav; Rodriguez, Antonio C. +2 more