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STELLAR VARIABILITY OF THE EXOPLANET HOSTING STAR HD 63454
Kane, Stephen R.,Dragomir, Diana,Ciardi, David R.,Lee, Jae-Woo,Lo Curto, Gaspare,Lovis, Christophe,Naef, Dominique,Mahadevan, Suvrath,Pilyavsky, Genady,Udry, Stephane,Wang, Xuesong,Wright, Jason IOP Publishing 2011 The Astrophysical journal Vol.737 No.2
<P>Of the hundreds of exoplanets discovered using the radial velocity ( RV) technique, many are orbiting close to their host stars with periods less than 10 days. One of these, HD 63454, is a young active K dwarf which hosts a Jovian planet in a 2.82 day period orbit. The planet has a 14% transit probability and a predicted transit depth of 1.2%. Here we provide a re-analysis of the RV data to produce an accurate transit ephemeris. We further analyze 8 nights of time series data to search for stellar activity both intrinsic to the star and induced by possible interactions of the exoplanet with the stellar magnetospheres. We establish the photometric stability of the star at the 3 mmag level despite strong Ca II emission in the spectrum. Finally, we rule out photometric signatures of both star-planet magnetosphere interactions and planetary transit signatures. From this we are able to place constraints on both the orbital and physical properties of the planet.</P>
Luigi Petramala,D’Elia Lorenzo,Gino Iannucci,Antonio Concistré,Laura Zinnamosca,Cristiano Marinelli,Giuseppe De Vincentis,Antonio Ciardi,Giorgio De Toma,Claudio Letizia 대한내분비학회 2015 Endocrinology and metabolism Vol.30 No.4
Background: Cushing syndrome (CS) has been described as a killing disease due its cardiovascular complications. In fact, chronic cortisol excess leads to a constellation of complications, including hypertension, hyperglycemia, adiposity, and thromboembolism. The main vascular alteration associated with CS is atherosclerosis. Methods: Aim of this study was to analyze carotid intima-media thickness (cIMT) and ankle-brachial index (ABI), two surrogate markers of subclinical atherosclerosis in a consecutive series of CS patients, compared to patients with essential hypertension (EH) and health subjects (HS). Results: Patients with CS showed a significant increase (P<0.05) of cIMT (0.89±0.17 mm) compared to EH (0.81±0.16 mm) and HS (0.75±0.4 mm), with a high prevalence of plaque (23%; P<0.03). Moreover, CS patients showed a mean ABI values (1.07±0.02) significantly lower respect to HS (1.12±0.11; P<0.05), and a higher percentage (20%) of pathological values of ABI (≤0.9; P<0.03). Conclusion: In conclusion, we confirmed and extended the data of cIMT in CS, and showed that the ABI represent another surrogate marker of subclinical atherosclerosis in this disease.