Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1K098

Analysis of stellar winds of solar-like stars with the JVLA and ALMA to define mass loss rates for the young Sun

Fichtinger, Bibiana (University of Vienna)
Guedel, Manuel (University of Vienna)
Hallinan, Gregg (Caltech Astronomy Pasadena)
Mutel, Robert (University of Iowa)
Lynch, Christene (University of Iowa)
Skinner, Stephen (University of Colorado)
Gaidos, Eric (University of Hawaii)
PatH collaboration, ()

A warm climate on the young Earth 4 Gyr ago was essential for the formation and evolution of life on our planet. Solar standard models however predict a lower solar luminosity than at present. If the Earth had no atmosphere its temperature would have been 235 K only, while present-day greenhouse gases would raise the temperature to ~253 K, which is still too cold to defrost the entire surface. To solve this so called “Faint Young Sun Paradox”, an astrophysical hypothesis has been proposed (Sackmann and Boothroyd, 2003 and references therein). It assumes that the Sun was brighter than according to the standard models, which would be possible if the Sun had been more massive than today. Consequently, a higher mass loss rate driven by the solar wind would have occurred. For an estimate of the enhanced young solar wind, we are trying to detect the free-free emission radio flux of young solar analogs on the main sequence to determine a mass loss rate or upper limits. We use the Karl G. Jansky Very Large Array (JVLA) and the Atacama Large Millimeter/submillimeter Array (ALMA).

Click here to view poster PDF