The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866914848619626496 |
|---|---|
| author | Isaacson, Howard Howard, Andrew W. Fulton, Benjamin Petigura, Erik A. Weiss, Lauren M. Kane, Stephen R. Carter, Brad Beard, Corey Giacalone, Steven Van Zandt, Judah Murphy, Joseph M. Akana Dai, Fei Chontos, Ashley Polanski, Alex S. Rice, Malena Lubin, Jack Brinkman, Casey Rubenzahl, Ryan A. Blunt, Sarah Yee, Samuel W. MacDougall, Mason G. Dalba, Paul A. Tyler, Dakotah Behmard, Aida Angelo, Isabel Pidhorodetska, Daria Mayo, Andrew W. Holcomb, Rae Turtelboom, Emma V. Hill, Michelle L. Bouma, Luke G. Zhang, Jingwen Crossfield, Ian J. M. Saunders, Nicholas |
| author_facet | Isaacson, Howard Howard, Andrew W. Fulton, Benjamin Petigura, Erik A. Weiss, Lauren M. Kane, Stephen R. Carter, Brad Beard, Corey Giacalone, Steven Van Zandt, Judah Murphy, Joseph M. Akana Dai, Fei Chontos, Ashley Polanski, Alex S. Rice, Malena Lubin, Jack Brinkman, Casey Rubenzahl, Ryan A. Blunt, Sarah Yee, Samuel W. MacDougall, Mason G. Dalba, Paul A. Tyler, Dakotah Behmard, Aida Angelo, Isabel Pidhorodetska, Daria Mayo, Andrew W. Holcomb, Rae Turtelboom, Emma V. Hill, Michelle L. Bouma, Luke G. Zhang, Jingwen Crossfield, Ian J. M. Saunders, Nicholas |
| contents | We present optical spectroscopy of 710 solar neighborhood stars collected over twenty years to catalog chromospheric activity and search for stellar activity cycles. The California Legacy Survey stars are amenable to exoplanet detection using precise radial velocities, and we present their Ca II H and K time series as a proxy for stellar and chromospheric activity. Using the HIRES spectrometer at Keck Observatory, we measured stellar flux in the cores of the Ca II H and K lines to determine S-values on the Mt. Wilson scale and the log(R'HK) metric, which is comparable across a wide range of spectral types. From the 710 stars, with 52,372 observations, 285 stars are sufficiently sampled to search for stellar activity cycles with periods of 2-25 years, and 138 stars show stellar cycles of varying length and amplitude. S-values can be used to mitigate stellar activity in the detection and characterization of exoplanets. We use them to probe stellar dynamos and to place the Sun's magnetic activity into context among solar neighborhood stars. Using precise stellar parameters and time-averaged activity measurements, we find tightly constrained cycle periods as a function of stellar temperature between log(R'HK) of -4.7 and -4.9, a range of activity in which nearly every star has a periodic cycle. These observations present the largest sample of spectroscopically determined stellar activity cycles to date. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_17332 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars Isaacson, Howard Howard, Andrew W. Fulton, Benjamin Petigura, Erik A. Weiss, Lauren M. Kane, Stephen R. Carter, Brad Beard, Corey Giacalone, Steven Van Zandt, Judah Murphy, Joseph M. Akana Dai, Fei Chontos, Ashley Polanski, Alex S. Rice, Malena Lubin, Jack Brinkman, Casey Rubenzahl, Ryan A. Blunt, Sarah Yee, Samuel W. MacDougall, Mason G. Dalba, Paul A. Tyler, Dakotah Behmard, Aida Angelo, Isabel Pidhorodetska, Daria Mayo, Andrew W. Holcomb, Rae Turtelboom, Emma V. Hill, Michelle L. Bouma, Luke G. Zhang, Jingwen Crossfield, Ian J. M. Saunders, Nicholas Solar and Stellar Astrophysics Earth and Planetary Astrophysics We present optical spectroscopy of 710 solar neighborhood stars collected over twenty years to catalog chromospheric activity and search for stellar activity cycles. The California Legacy Survey stars are amenable to exoplanet detection using precise radial velocities, and we present their Ca II H and K time series as a proxy for stellar and chromospheric activity. Using the HIRES spectrometer at Keck Observatory, we measured stellar flux in the cores of the Ca II H and K lines to determine S-values on the Mt. Wilson scale and the log(R'HK) metric, which is comparable across a wide range of spectral types. From the 710 stars, with 52,372 observations, 285 stars are sufficiently sampled to search for stellar activity cycles with periods of 2-25 years, and 138 stars show stellar cycles of varying length and amplitude. S-values can be used to mitigate stellar activity in the detection and characterization of exoplanets. We use them to probe stellar dynamos and to place the Sun's magnetic activity into context among solar neighborhood stars. Using precise stellar parameters and time-averaged activity measurements, we find tightly constrained cycle periods as a function of stellar temperature between log(R'HK) of -4.7 and -4.9, a range of activity in which nearly every star has a periodic cycle. These observations present the largest sample of spectroscopically determined stellar activity cycles to date. |
| title | The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2406.17332 |