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2020ApJ...891...96J - Astrophys. J., 891, 96-96 (2020/March-1)

Sun-like stars shed light on solar climate forcing.


Abstract (from CDS):

Recently published precise stellar photometry of 72 Sun-like stars obtained at the Fairborn Observatory between 1993 and 2017 is used to set limits on the solar forcing of Earth's atmosphere of ±4.5 W m–2 since 1750. This compares with the +2.2 ± 1.1 W m–2 IPCC estimate for anthropogenic forcing. Three critical assumptions are made. In decreasing order of importance they are: (a) most of the brightness variations occur within the average time series length of ≃17 yr; (b) the Sun seen from the ecliptic behaves as an ensemble of middle-aged solar-like stars; and (c) narrowband photometry in the Stromgren b and y bands are linearly proportional to the total solar irradiance. Assumption (a) can best be relaxed and tested by obtaining more photometric data of Sun-like stars, especially those already observed. Eight stars with near-solar parameters have been observed from 1999, and two since 1993. Our work reveals the importance of continuing and expanding ground-based photometry, to complement expensive solar irradiance measurements from space.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): The Sun - Solar analogs - Solar spectral irradiance

Simbad objects: 24

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