Science Highlights

Scroll down to find more information about refereed publications and current research projects.
Click on images/visualizations for short descriptions.

Refereed publications

• The magnetic nature of the cataclysmic variable period gap

Garraffo, C.; Drake, J. J.; Alvarado-Gómez, J. D.; Moschou, S. P.; Cohen, O.
Keywords: Binaries: Close — Stars: Activity — Stars: Magnetic Fields — Stars: Laye-Type — Stars: Rotation

This work has been published in The Astrophysical Journal.

• Synthetic radio imaging for quiescent and CME-flare scenarios

Moschou, S. P.; Sokolov, I. V.; Cohen, O.; Drake, J. J.; Borovikov, D.; Kasper, J. C.; Alvarado-Gómez, J. D.; Garraffo, C.
Keywords: Sun: Activity — Sun: Corona — Sun: Coronal Mass Ejections (CMEs) — Sun: Flares — Radio Emission

This work has been published in The Astrophysical Journal.

• Exoplanet modulation of stellar coronal radio emission

Cohen, O.; Moschou, S. P.; Glocer, A.; Sokolov, I. V.; Mazeh, T.; Drake, J. J.; Garraffo, C.; Alvarado-Gómez, J. D.
Keywords: Star-Planet Interactions — Planets and Satellites: Magnetic Fields — Plasmas — Radio Continuum: Planetary Systems

This work has been published in The Astronomical Journal.

• Suppression of coronal mass ejections in active stars by an overlying large-scale magnetic field: A numerical study

Alvarado-Gómez, J. D.; Drake, J. J.; Cohen, O.; Moschou S. P.; Garraffo, C.
Keywords: Magnetic Fields — Magnetohydrodynamics (MHD) — Stellar Activity — Stellar Winds — Coronal Mass Ejections (CME)

This work has been published in The Astrophysical Journal.

• The revolution revolution: magnetic morphology driven spin-down

Garraffo, C.; Drake, J. J.; Dotter, A.; Choi, J.; Burke, D. J.; Moschou S. P.; Alvarado-Gómez, J. D.; Kashyap, V. L.; Cohen, O.
Keywords: Stellar Evolution — Stellar Rotation — Magnetic Fields

This work has been published in The Astrophysical Journal.

• A monster CME obscuring a demon star flare

Moschou S. P.; Drake, J. J.; Cohen, O.; Alvarado-Gómez, J. D.; Garraffo, C.
Keywords: Eclipsing Binaries — Stellar Flares — Late-Type Stars — Coronal Mass Ejections (CME) — X-rays

This work has been published in The Astrophysical Journal.

• Far beyond the Sun: I. The beating magnetic heart in Horologium

Alvarado-Gómez, J. D.; Hussain, G. A. J.; Drake, J. J.; Donati, J.-F.; Sanz-Forcada, J.; Stelzer, B.; Cohen, O.; Amazo-Gómez E. M.; Grunhut, J. H.; Garraffo, C.; Moschou S. P.; Silvester, J.; Oksala M. E.
Keywords: Magnetic Fields — Exoplanet Host — Solar-Type Stars — Spectropolarimetry — Stellar Activity

This work has been published in Monthly Notices of the Royal Astronomical Society.

• The threatening magnetic and plasma environment of the TRAPPIST-1 planets

Garraffo, C.; Drake, J. J.; Cohen, O.; Alvarado-Gómez, J. D.; Moschou S. P.
Keywords: Magnetic Fields — Magnetohydrodynamics (MHD) — Stellar Activity — Stellar Winds

This work has been published in The Astrophysical Journal Letters.

• Simulating the environment around planet-hosting stars — II. Stellar winds and inner astrospheres

Alvarado-Gómez, J. D.; Hussain, G. A. J.; Cohen, O.; Drake, J. J.; Garraffo, C.; Grunhut, J.; Gombosi, T.I.
Keywords: Stellar Winds — Mass-Loss — Magnetic Fields — Late-Type — Magnetohydrodynamics (MHD)

This work has been published as cover of Volume 594 of Astronomy & Astrophysics.

• Simulating the environment around planet-hosting stars — I. Coronal structure

Alvarado-Gómez, J. D.; Hussain, G. A. J.; Cohen, O.; Drake, J. J.; Garraffo, C.; Grunhut, J.; Gombosi, T.I.
Keywords: Coronae — Magnetic Fields — Late-Type — Magnetohydrodynamics (MHD)

This work has been published in Astronomy & Astrophysics.

• Impulsivity parameter for solar flares

Fajardo-Mendieta W. G.; Martínez-Oliveros, J. C.; Alvarado-Gómez, J. D.; Calvo-Mozo, B.
Keywords: Solar Flares — Impulsive Phase — Hard X-ray

This work has been published in The Astrophysical Journal.

• A spectro-polarimetric study of the planet-hosting G-dwarf, HD 147513

Hussain, G. A. J.; Alvarado-Gómez, J. D.; Grunhut, J.; Donati, J.-F.; Alecian, E.; Oksala, M.; Morin, J.; Fares, R.; Jardine, M.; Drake, J. J.; Cohen, O.; Matt, S.; Petit, P.; Redfield, S.; Walter, F. M.
Keywords: Activity — Magnetic Fields — Solar Type — Spectropolarimetry — Radial Velocities

This work has been published in Astronomy & Astrophysics.

• Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237

Alvarado-Gómez, J. D.; Hussain, G. A. J.; Grunhut, J.; Fares, R.; Donati, J.-F.; Alecian, E.; Kochukhov, O.; Oksala, M.; Morin, J.; Redfield, S.; Cohen, O.; Drake, J. J.; Jardine, M.; Matt, S.; Petit, P.; Walter, F. M.
Keywords: Activity — Magnetic Fields — Solar Type — Spectropolarimetry — Zeeman Doppler Imaging (ZDI)

This work has been published in Astronomy & Astrophysics.

• Magneto-acoustic energetics study of the seismically active flare of 15 February 2011

Alvarado-Gómez, J. D.; Buitrago-Casas, J. C.; Martínez-Oliveros, J. C.; Lindsey, C.; Hudson, H.; Calvo-Mozo, B.
Keywords: Magnetic Field Variation — Flares— Local Helioseismology — Sunquakes

This work has been published in Solar Physics.

Current projects

• Weaving the history of the solar wind with magnetic field lines

Type: Observing Time Proposal | P.I.: Julián D. Alvarado-Gómez
Co-Investigators: Amazo-Gómez, E. M.; Cohen, O.; Drake, J. J.; Garraffo, C.; Hussain, G. A. J.; Moschou, S. P.; Redfield, S.; Sanz-Forcada, J.; Stelzer, B.; Wood, B. E.
Telescope/Instrument: HST/STIS
Allocated time: 15 Orbits
Cycles: 25 & 26

• Characterizing the winds of M-dwarf stars

Type: Observing Time Proposal | P.I.: Brian E. Wood
Co-Investigators: Alvarado-Gómez, J. D.; Cohen, O.; Drake, J. J.; Garraffo, C.; Jardine, M.; Linsky, J.; Redfield, S.; Vidotto, A.
Telescope/Instrument: HST/STIS
Allocated time: 36 Orbits
Cycle: 25

• Searching for atmospheric loss signatures in the newly discovered super-Earth GJ 9827b

Type: Observing Time Proposal | P.I.: Seth Redfield
Co-Investigators: Alvarado-Gómez, J. D.; Cauley, P.; France, K.; Gandolfi, D.; Guenther, E.; Hussain, G. A. J.; Linsky, J.; Livingston, J.; Narita, N.; Niraula, P.; Shkolnik, E.; Wood, B.; Youngblood, A.
Telescope/Instrument: HST/STIS
Allocated time: 9 Orbits
Cycle: 25 (Mid-cycle proposal)

• X-rays beyond the wind dividing line

Type: Observing Time Proposal | P.I.: Julián D. Alvarado-Gómez
Co-Investigators: Drake, J. J.; Redfield, S.; Sanz-Forcada, J.; Stelzer, B.; Wood, B. E.
Telescope/Instrument: XMM-Newton/EPIC
Allocated time: 20 ks
Period: AO-17

• The high-energy environment of the triple super-earth host GJ 9827

Type: Observing Time Proposal | P.I.: Jeremy J. Drake
Co-Investigators: Alvarado-Gómez, J. D.; Hussain, G. A. J.; Redfield, S.; Cohen, O.; Garraffo, C.; Moschou, S. P.
Telescope/Instrument: XMM-Newton/EPIC
Allocated time: 30 ks
Period: AO-17

• The puzzling activity cycle of the planet-host star ι Hor

Type: Observing Time Proposal | P.I.: Jorge Sanz-Forcada
Co-Investigators: Stelzer, B.; Alvarado-Gómez, J. D.; Amazo-Gómez, E. M.
Telescope/Instrument: XMM-Newton/EPIC
Allocated time: 20 ks
Period: AO-16

• Stellar activity and space weather in the GJ 9827 system

Type: Observing Time Proposal | P.I.: Gaitee A. J. Hussain
Co-Investigators: Alvarado-Gómez, J. D.; Gandolfi, D.; Prieto-Arranz, J.; Redfield, S.; Niraula, P.; Drake, J. J.
Telescope/Instrument: ESO 3.6m/HARPSpol
Allocated time: 40.0 Hours | Top-Ranked proposal
Period: P102

• The magnetic cycle and planetary environment of the young Sun ι Hor: Project finale

Type: Observing Time Proposal
Co-Investigators: Hussain, G. A. J.; Drake, J. J.; Sanz-Forcada, J.; Stelzer, B.; Cohen, O.; Amazo-Gómez, E. M.; Grunhut, J.; Donati, J.-F.
Telescope/Instrument: ESO 3.6m/HARPSpol
Allocated time: 45.0 Hours | Top-Ranked proposal
Period: P101

• The magnetic cycle and planetary environment of the young Sun ι Hor: The reign of the positive polarity

Type: Observing Time Proposal
Co-Investigators: Hussain, G. A. J.; Drake, J. J.; Sanz-Forcada, J.; Stelzer, B.; Cohen, O.; Amazo-Gómez, E. M.; Grunhut, J.; Donati, J.-F.
Telescope/Instrument: ESO 3.6m/HARPSpol
Allocated time: 36.0 Hours | Top-Ranked proposal
Period: P100

• The magnetic cycle and planetary environment of the young Sun ι Hor: Catching the polarity reversal

Type: Observing Time Proposal
Co-Investigators: Hussain, G. A. J.; Drake, J. J.; Sanz-Forcada, J.; Stelzer, B.; Cohen, O.; Amazo-Gómez, E. M.; Grunhut, J.; Donati, J.-F.
Telescope/Instrument: ESO 3.6m/HARPSpol
Allocated time: 45.0 Hours | Top-Ranked proposal
Period: P99

• The magnetic cycle and planetary environment of the young Sun ι Hor: Towards activity minimum

Type: Observing Time Proposal
Co-Investigators: Hussain, G. A. J.; Cohen, O.; Sanz-Forcada, J.; Stelzer, B.; Amazo-Gómez, E. M.; Grunhut, J.; Drake, J. J.
Telescope/Instrument: ESO 3.6m/HARPSpol
Allocated time: 40.0 Hours | Top-Ranked proposal
Period: P98

• The magnetic field and planetary environment of the young Sun ι Hor: Following the Activity Cycle

  Type: Observing Time Proposal
  Co-Investigators: Hussain, G. A. J.; Grunhut, J.; Stelzer, B.; Sanz-Forcada, J.; Cohen, O.; Drake, J. J.
  Telescope/Instrument: ESO 3.6m/HARPSpol
  Allocated time: 37.0 Hours | Top-Ranked proposal
  Period: P97

• Far beyond the Sun: Mapping the magnetic cycle of the young solar-analog ι Hor

Type: Observing Time Proposal
Co-Investigators: Hussain, G. A. J.; Grunhut, J.; Stelzer, B.; Sanz-Forcada, J.; Cohen, O.; Drake, J. J.
Telescope/Instrument: ESO 3.6m/HARPSpol
Allocated time: 33.6 Hours
Period: P96

• Mapping magnetic fields to model mass loss rates in moderately active Sun-like stars

Type: Observing Time Proposal
Co-Investigators: Hussain, G. A. J.; Morin, J.; Donati, J.-F.; Folsom, C.; Petit, P.; Hebrard, E.
Telescope/Instrument: Télescope Bernard Lyot/NARVAL
Allocated time: 19.0 Hours
Period: 2015-A

• Coronal mass ejections in the Chandra-Kepler flare survey

Type: Computing Time Proposal
Co-Investigator: Drake, J. J.
Facility/Cluster: NASA Advanced Supercomputing Division/Pleiades cluster
Allocated time: 140k core hours
Period: 2018-2020

• Coronal mass ejections in the Chandra-Kepler flare survey

Type: Computing Time Proposal
Co-Investigator: Drake, J. J.
Facility/Cluster: XSEDE Ecosystem/Comet + superMIC clusters
Allocated time: 100k core hours
Period: 2017-2018

• Modeling the corona, winds and space weather conditions in moderately active Sun-like stars

Type: Computing Time Proposal
Co-Investigators: Hussain, G. A. J.; Drake, J. J.; Cohen, O.
Facility/Cluster: Leibniz Supercomputing Centre (LRZ)/Computational Center for Particle and Astrophysics (C2PAP)
Allocated time: 840k core hours
Period: 2015-2017

External Interests

The balance between body and mind is fundamental. While Astrophysics puts my mind to the test, I have found in the discipline of Calisthenics a natural path for developing body strength, agility, and resistance. You can check some of my progress below.

«No man has the right to be an amateur in the matter of physical training.
It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable»

—Socrates.

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