On the Incidence of Wise Infrared Excess Among Solar Analog, Twin, and Sibling Stars

Abstract

This study presents a search for IR excess in the 3.4, 4.6, 12 and 22 µm bands in a sample of 216 targets, composed of solar sibling, twin and analog stars observed by the WISE mission. In general, an infrared excess suggests the existence of warm dust around a star. We detected 12 µm and/or 22 µm excesses at the 3σ level of confidence in five solar analog stars, corresponding to a frequency of 4.1 % of the entire sample of solar analogs analyzed, and in one out of 29 solar sibling candidates, confirming previous studies. The estimation of the dust properties shows that the sources with infrared excesses possess circumstellar material with temperatures that, within the uncertainties, are similar to that of the material found in the asteroid belt in our solar system. No photospheric flux excess was identified at the W1 (3.4 µm) and W2 (4.6 µm) WISE bands, indicating that, in the majority of stars of the present sample, no detectable dust is generated. Interestingly, among the sixty solar twin stars analyzed in this work, no WISE photospheric flux excess was detected. However, a null-detection excess does not necessarily indicate the absence of dust around a star because different causes, including dynamic processes and instrument limitations, can mask its presence.

Debris Disks among Kepler Solar Rotational Analog Stars

“…These bodies can give fundamental informations about the chemistry and evolution of protoplanetary disk and the planetary systems they form. Despite a similar physical mechanism to be expected in the production of the reported debris disks, our findings show that stars with physical parameters similar to the Sun, as is the case of the whole sample here analyzed, can in fact be very different from the Sun once the star and its circumstellar environment are considered, confirming previous results by Da Costa et al (2017). Among these physical parameters, age is an important one for determining the presence of debris disks.…”

“…Although the presence of debris disks, with asteroid belt characteristics, is now well established for hundreds of stars (Chen et al 2006;Cotten & Song 2016;Trilling et al 2008;Weissman 1995;Aumann et al 1984;Patel et al 2014), the present day literature pints for a scarcity of asteroid belt signatures around Sun-like stars (Da Costa et al 2017;Sibthorpe et al 2018). For instance, a recent study has shown a null detection of warm debris around solar twin stars (Da Costa et al 2017).…”

“…In order to identify which stars have a reliable IR excess, with no artificial artifacts or contamination, we applied to the sample of 47 stars the same procedure used by DaCosta et al (2017) for a visual inspection of the WISE images, based on the identification of some significant problems as PSFs (Point Spread Function) deformed due to an object close to the source, an absent or no evident object, or even caused by nearby objects blended, leading to a misinterpretation of the image. The WISE images were obtained from IRSA (Infrared Science Archive), using 0-3σ linear scales around 1.7 ×1.7 RESULTS Assuming that the detected IR excess in the stars KIC 1868785, KIC 7267949, KIC 7435796, KIC 10533222, KIC 11092105 and KIC 11666436 is related to IR radiation emitted by circumstellar dust,…”

Stellar age dependence of the nonextensive magnetic braking index: A test for the open cluster αPer

“…An important point is that eq. ( 6) describes the behaviour of the disc-less stars and, therefore, it is not suitable for very young stars, because they have a thick dust disc in the infrared [40]. On the other hand, accreting stars have a physics more complex than that of non-accreting stars, because the star-disc interaction controls the rotation [41].…”