Search Publications
Unveiling the purely young star formation history of the SMC's northeastern shell from colour-magnitude diagram fitting
Choi, Yumi; Ruiz-Lara, Tomás; Nidever, David L. +12 more
We obtain a quantitative star formation history (SFH) of a shell-like structure ('shell') located in the northeastern part of the Small Magellanic Cloud (SMC). We use the Survey of the MAgellanic Stellar History to derive colour-magnitude diagrams (CMDs), reaching below the oldest main-sequence turnoff, from which we compute the SFHs with CMD-fitt…
Molecular clouds in M51 from high-resolution extinction mapping
Peretto, Nicolas; Smith, Matthew W. L.; Davis, Timothy A. +5 more
Here, we present the cloud population extracted from M51, following the application of our new high-resolution dust extinction technique to the galaxy. With this technique, we are able to image the gas content of the entire disc of M51 down to 5 pc (0.14 arcsec), which allows us to perform a statistical characterization of well-resolved molecular …
Characterization of starspots on a young M-dwarf K2-25: multiband observations of stellar photometric variability and planetary transits
Ikuta, Kai; Tamura, Motohide; Livingston, John H. +13 more
Detailed atmospheric characterization of exoplanets by transmission spectroscopy requires careful consideration of stellar surface inhomogeneities induced by star-spots. This effect is particularly problematic for planetary systems around M-dwarfs, and their spot properties are not fully understood. We investigated the stellar activity of the youn…
Ly α emission strength and stellar properties of faint galaxies from 5 < z < 8.2
Pentericci, Laura; Treu, Tommaso; Jones, Gareth C. +6 more
We present a study on stellar properties of Lyman-alpha (Ly α) emitters at 5 < z < 8.2. We use 247 photometrically selected, lensed, high-redshift, low-luminosity galaxy candidates with spectroscopic follow-up. Of these, 38 are confirmed spectroscopically to be between 5 < z < 8.2 via detection of Ly α. For each galaxy and candidate, w…
Characterization of the δ Scuti eclipsing binary KIC 4851217 and its tertiary companion as well as detection of tidally tilted pulsations
Handler, G.; Southworth, J.; Kurtz, D. W. +3 more
Stellar theory enables us to understand the properties of stars at different stages of their evolution, and contributes to other fields of astrophysics such as galactic and exoplanet studies. Assessing the accuracy of stellar theories necessitates high precision, model-independent measurements of the properties of real stars, such as those obtaina…
Deeper than DEEP: a spectroscopic survey of z > 3 Ly α emitters in the Extended Groth Strip
Finkelstein, Steven L.; Pérez-González, Pablo G.; Bagley, Micaela B. +13 more
We present a spectroscopic survey of Ly α emitters in the Extended Groth Strip (EGS) field, targeting the regime near the Epoch of Reionization. Using Keck/DEep Imaging Multi-Object Spectrograph, we observed 947 high-z candidates with photometric redshifts from 3 < zphot < 7 and down to an H-band (Hubble Space Telescope/Wide Field…
Discovery and timing of pulsar J2016+3711 in supernova remnant CTB 87 with FAST
Li, Di; Zhou, Ping; Chen, Yang +4 more
We report on our discovery of the radio pulsar, PSR J2016+3711, in supernova remnant (SNR) CTB 87, with a ~10.8σ significance of pulses, which confirms the compact nature of the X-ray point source in CTB 87. It is the first pulsar discovered in SNRs using Five-hundred-meter Aperture Spherical radio Telescope (FAST). Its integrated radio pulse prof…
Ultracool spectroscopic outliers in Gaia DR3
Sarro, L. M.; Cooper, W. J.; Smart, R. L. +1 more
Gaia DR3 provided a first release of RP spectra and astrophysical parameters for ultracool dwarfs (UCDs). We used these Gaia RP spectra and astrophysical parameters to select the most outlying UCDs. These objects have spectral types of M7 or later and might be young brown dwarfs or low-metallicity objects. This work aimed to find UCDs that have Ga…
Spatiotemporal map of star clusters in the Magellanic Clouds using Gaia: synchronized peaks and radial shrinkage of cluster formation
Subramanian, S.; Subramaniam, A.; Nayak, Prasanta K. +1 more
We present a detailed view of cluster formation (CF) to trace the evolution and interaction history of the Magellanic Clouds (MCs) in the last 3.5 Gyr. Using the Gaia DR3 data, we parametrized 1710 and 280 star clusters in the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC), where 847 and 113 clusters are newly characterized in t…
The peculiar bursting nature of CP Pup
Knigge, C.; Done, C.; Scaringi, S. +5 more
The classical nova CP Puppis has been observed to have particularly puzzling and peculiar properties. In particular, this classical nova displays occasional bursts in its long-term ASAS-SN light curve. Here, we report on five sectors of TESS data displaying two of these rapid bursts, lasting ~1 d. Based on the estimated lower energy limits of the …