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CONSTRAINING SUPERNOVA PROGENITORS: AN INTEGRAL FIELD SPECTROSCOPIC SURVEY OF THE EXPLOSION SITES
KUNCARAYAKTI, H.,ALDERING, G.,ANDERSON, J.P.,ARIMOTO, N.,DOI, M.,GALBANY, L.,HAMUY, M.,HASHIBA, Y.,KRUEHLER, T.,MAEDA, K.,MOROKUMA, T.,USUDA, T. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We describe a survey of nearby core-collapse supernova (SN) explosion sites using integral field spectroscopy (IFS) techniques, which is an extension of the work described in Kuncarayakti et al. (2013). The project aims to constrain SN progenitor properties based on the study of the immediate environment of the SN. The stellar populations present at the SN explosion sites are studied by means of integral field spectroscopy, which enables the acquisition of both spatial and spectral information of the object simultaneously. The spectrum of the SN parent stellar population gives an estimate of its age and metallicity. With this information, the initial mass and metallicity of the once coeval SN progenitor star are derived. While the survey is mostly done in optical, the additional utilization of near-infrared integral field spectroscopy assisted with adaptive optics (AO) enables us to examine the explosion sites in high spatial detail, down to a few parsecs. This work is being carried out using multiple 2-8 m class telescopes equipped with integral field spectrographs in Chile and Hawaii.
The Discovery of a Gravitationally Lensed Supernova Ia at Redshift 2.22
Rubin, D.,Hayden, B.,Huang, X.,Aldering, G.,Amanullah, R.,Barbary, K.,Boone, K.,Brodwin, M.,Deustua, S. E.,Dixon, S.,Eisenhardt, P.,Fruchter, A. S.,Gonzalez, A. H.,Goobar, A.,Gupta, R. R.,Hook, I.,Jee American Astronomical Society 2018 The Astrophysical journal Vol.866 No.1
Sorena Keihani,Nathan J. Alder,Philip J. Cheng,Gregory J. Stoddard,Alexander W. Pastuszak,James M. Hotaling 대한남성과학회 2020 The World Journal of Men's Health Vol.38 No.4
Purpose: To assess the conversion rate from clomiphene citrate (CC) monotherapy to combination CC+anastrozole (AZ) therapy in hypogonadal men and the predictors associated with the initiation of AZ. Materials and Methods: A retrospective review of records from hypogonadal men treated with CC in a single fertility center was performed from 2013 to 2018. Patient age, body mass index (BMI), blood pressure, and reproductive hormones were obtained at baseline. Obesity was defined as BMI≥30 kg/m2. Cox proportional hazards models were used to identify predictors of switching to combination CC+AZ therapy. Results: A total of 318 men on CC were included. Median (interquartile range) age was 34 years (30–39 years) and patients were followed for a median of 9 months (4–17 months). Of these, 97 (30.5%) were started on CC+AZ therapy. These patients had higher baseline BMI and estradiol, which in multivariable regression were significant predictors for switching to CC+AZ therapy. A threshold of 18.5 pg/mL for baseline estradiol provided the highest accuracy for predicting the addition of AZ after adjusting for baseline BMI and total testosterone levels. Conclusions: In our practice, following CC monotherapy, 30% of men were initiated on CC+AZ. Obesity (BMI≥30 kg/m2) and baseline estradiol ≥18.5 pg/mL can predict the conversion to combination therapy with addition of AZ. This information can be used to counsel patients and also help to identify patients who can be started on combination therapy upfront.