Kinich Pakal

Last updated on Jun 17, 2021

F. Tapia-Vázquez & De la Luz, 2020

The atmosphere of the Solar-like stars is composed of the photosphere, chromosphere, transition zone, and corona. The chromosphere is the layer where the temperature goes from 4000 K to 8000 K and is studied at ultraviolet, visible, infrared, millimeter and (sub)-millimeter wavelengths (Wedemeyer et al. 2016)¹. The first chromospheric models were obtained thanks to the ultraviolet observations (Vernazza et al. 1981; Avrett & Loeser 2008)² ³. However, recent observations made with the Solar Submillimeter Telescope (SST) and the Atacama Large Millimeter / Submillimeter Array (ALMA) have shown that the chromosphere has lower temperatures than expected by ultraviolet models (Linsky 2017). ⁴

We have developed the KINICH-PAKAL (Tapia-Vázquez, & De la Luz 2020)⁵ code that use the Levenberg-Marquard algorithm as a nonlinear fit method, PAKAL-MPI as a chromospheric model of the solar atmosphere, and observations at wavelengths ranging from infrared to millimeter to generate a more accurate model of the chromospheres of the solar-type stars. KINICH-PAKAL has allowed us to study in detail how the physical conditions of the atmosphere change as a function of its effective temperature. Developing these models is necessary for debris disk studies (White et al. 2018)⁶, study the conditions under which flares are formed (MacGregor et al.2018)⁷ and the possible physical mechanisms of flux variations in the stars (Liseau 2019)⁸.

References

Wedemeyer, S., Bastian, T., Brajša, R., et al. 2016, SSRv, 200, 1. ↩︎
Vernazza, J. E., Avrett, E. H., & Loeser, R. 1981, ApJS,45, 635. ↩︎
Avrett, E. H., & Loeser, R. 2008, ApJS, 175, 229. ↩︎
Linsky, J. L. 2017, ARA&A, 55, 159. ↩︎
Tapia-Vázquez, F., & De la Luz, V. 2020, ApJS, 246, 5. ↩︎
White, J.A., Aufdenberg, J., Boley, A.C., 2018, ApJ,859(2), p.102. ↩︎
MacGregor, M. A., Weinberger, A. J., Wilner, D. J., Kowalski, A. F., & Cranmer, S. R. 2018, ApJ, 855, L2. ↩︎
Liseau, R. 2019, arXiv:1904.03043. ↩︎

Stellar Radioastronomy

Posts

New Insights into Stellar Atmospheres at Millimeter, Sub-millimeter, and Infrared wavelengths

kinich-pakal

Francisco Tapia Vázquez, Victor De la Luz, Luis Zapata, Jacob White

Last updated on Jul 4, 2022 5 min read Blog

New Insights into Stellar Atmospheres at Millimeter, Sub-millimeter, and Infrared wavelengths

Publications

The First Radio Spectrum of a Rapidly Rotating A-type Star

We present the first radio spectrum of an A-type star.

White, Jacob Aaron, Francisco Tapia Vázquez, Hughes, A. G, Moór, A, Matthews, B, Wilner, D, Aufdenberg, J, Fehér, O, Hughes, A. M, De la Luz, V, McNaughton, A

The First Radio Spectrum of a Rapidly Rotating A-type Star

The MESAS Project: ALMA Observations of the F-type Stars γ Lep, γ Vir A, and γ Vir B

We present Atacama Large Millimeter/submillimeter Array observations of the three nearby, main-sequence, debris-poor, F-type stars γ Lep, γ Vir A, and γ Vir B at 0.87 and 1.29 mm.

White, Jacob Aaron, Francisco Tapia Vázquez, Hughes, A. G, Moór, A, Matthews, B, Wilner, D, Aufdenberg, J, Hughes, A. M, De la Luz, V, Boley, A. C

The MESAS Project: ALMA Observations of the F-type Stars γ Lep, γ Vir A, and γ Vir B

Nonlinear Convergence of Solar-like Stars Chromospheres Using Millimeter, Submillimeter, and Infrared Observations

In this work, we present a new methodology to fit the observed and synthetic spectrum of main-sequence stars through semiempirical models.

Francisco Tapia Vázquez, De la Luz, V

Nonlinear Convergence of Solar-like Stars Chromospheres Using Millimeter, Submillimeter, and Infrared Observations

ALMA's view of the nearest neighbors to the Sun. The submm/mm SEDs of the α Centauri binary and a new source

The precise mechanisms that provide the nonradiative energy for heating the chromosphere and corona of the Sun and other stars are at the focus of intense contemporary research.

Liseau, R, De la Luz, V, O'Gorman, E, Bertone, E, Chavez, M, Francisco Tapia Vázquez

ALMA's view of the nearest neighbors to the Sun. The submm/mm SEDs of the α Centauri binary and a new source

Events

Modeling Altair’s Atmosphere

Presentation No.208.08 in the session “Stars I”.

Jun 7, 2021 9:00 AM — Jun 9, 2021 6:00 PM Virtual Meeting

Francisco Tapia Vázquez, White, J, Hughes, A.G, Moór, A, Matthews, B, Wilner, D, Aufdenberg, J, Fehér, O, Hughes, A.M, De la Luz, V, McNaughton, A, Zapata, L