HJ
Helen E. Jermak
astro-ph.HEastro-ph.SRastro-ph.GAastro-ph.IMastro-ph.EPastro-ph.COgr-qc
On Valency
published · living versionsW_pgxhv7hh·v1 · currentpublished
The First Post-Kepler Brightness Dips of KIC 8462852
with Tabetha S. Boyajian, Roi Alonso, Alex Ammerman, David Armstrong +201
1 version
Preprints & journals
48 papers in the corpus · 2015–2026The 4 meter New Robotic Telescope project: an updated report2603.04110v1 · C. M. Guti'errez, M. Torres, A. Oria et al.2026 · 0 citationsRev. Mex. A&A 53, (2021), 8
New Robotic Telescope: The big eye to observe the transient Universe2603.04151v1 · C. M. Guti'errez, J. Barrera, J. Bento et al.2026 · 0 citationsRev. Mex. A&A 698, (2025), 235
POLAMI Multi-Wavelength Polarization Study of AGN Jets: A Millimeter-Optical Comparison2601.10798v1 · C. Casadio, D. Blinov, I. Agudo et al.2026 · 0 citationsarXiv
First detection of VHE gamma-ray signal from the FSRQ TON 05992601.03873v2 · K. Abe, S. Abe, J. Abhir et al.2026 · 2 citationsMNRAS, 546, 4, (2026) stag032
Unveiling blazar synchrotron emission: a multiwavelength polarimetric study of HSP and LSP populations2508.14168v1 · Sara Capecchiacci, Ioannis Liodakis, Riccardo Middei et al.2025 · 0 citationsarXiv
Nighttime Cloud Detection, Tracking and Prediction with All-Sky Cameras2507.21711v1 · Sebastian Buntin, Chris M. Copperwheat, Helen E. Jermak2025 · 5 citationsarXiv
Determining the origin of the X-ray emission in blazars through multiwavelength polarization2505.13603v2 · Ioannis Liodakis, Haocheng Zhang, Stella Boula et al.2025 · 10 citationsA&A 698, L19 (2025)
High optical to X-ray polarization ratio reveals Compton scattering in BL Lacertae's jet2505.01832v1 · Ivan Agudo, Ioannis Liodakis, Jorge Otero-Santos et al.2025 · 16 citationsarXiv
The polarisation behaviour of OJ 287 viewed through radio, millimetre and optical observations between 2015 and 20172501.08652v1 · J. Jormanainen, T. Hovatta, E. Lindfors et al.2025 · 2 citationsA&A 694, A206 (2025)
Insights from the first flaring activity of a high-synchrotron-peaked blazar with X-ray polarization and VHE gamma rays2410.23140v3 · K. Abe, S. Abe, J. Abhir et al.2024 · 7 citationsA&A 695, A217 (2025)
Multi-wavelength study of OT 081: broadband modelling of a transitional blazar2410.22557v2 · H. Abe, S. Abe, V. A. Acciari et al.2024 · 4 citationsarXiv
A Two-Week Monitoring Campaign on Mrk 4212410.19983v1 · W. Peter Maksym, Ioannis Liodakis (1, M. Lynne Saade (3 et al.2024 · 8 citationsarXiv
Optical and near-infrared polarization of the black hole X-ray binary A0620-00 in quiescence2407.07592v2 · Vadim Kravtsov, Alexandra Veledina, Andrei V. Berdyugin et al.2024 · 1 citationA&A 703, A14 (2025)
Testing particle acceleration in blazar jets with continuous high-cadence optical polarization observations2406.15554v1 · Ioannis Liodakis, Sebastian Kiehlmann, Alan P. Marscher et al.2024 · 5 citationsA&A 689, A200 (2024)
IXPE observation of PKS 2155-304 reveals the most highly polarized blazar2406.01693v1 · Pouya M. Kouch, Ioannis Liodakis, Riccardo Middei et al.2024 · 36 citationsA&A 689, A119 (2024)
Distinguishing radiation mechanisms and particle populations in blazar jets through long-term multi-band monitoring with RINGO3 and Fermi2404.12835v2 · Callum McCall, Helen Jermak, Iain A. Steele et al.2024 · 3 citationsarXiv
The extreme coronal line emitter AT 2022fpx: Varying optical polarization properties and late-time X-ray flare2403.04877v2 · Karri I. I. Koljonen, Ioannis Liodakis, Elina Lindfors et al.2024 · 17 citationsarXiv
A study of Be stars in the time domain. I. Spectral data and polarimetry2403.01654v1 · Adri'an Castan'on Esteban, Iain Steele, Helen Jermak2024 · 1 citationarXiv
Detection of an intranight optical hard-lag with colour variability in blazar PKS 0735+1782402.00633v1 · Callum McCall, Helen E. Jermak, Iain A. Steele et al.2024 · 7 citationsarXiv
GRB 210619B: first gamma-ray burst detection by the novel polarimeter MOPTOP2306.04649v1 · M. Shrestha, I. A. Steele, S. Kobayashi et al.2023 · 0 citationsarXiv
Refining the prediction for OJ 287 next impact flare arrival epoch2209.08360v1 · Mauri J. Valtonen, Staszek Zola, A. Gopakumar et al.2022 · 3 citationsarXiv
RINGO3 polarimetry of very young ZTF supernovae2208.12285v1 · J. R. Maund, Y. Yang, I. A. Steele et al.2022 · 17 citations2021, MNRAS, 503, 1, 312-323
Polarimetry and Photometry of Gamma-Ray Bursts Afterglows with RINGO32208.01729v1 · M. Shrestha, I. A. Steele, S. Kobayashi et al.2022 · 9 citationsarXiv
Multiwavelength astrophysics of the blazar OJ 287 and the project MOMO2207.11291v1 · S. Komossa, A. Kraus, D. Grupe et al.2022 · 1 citationarXiv
Black hole spin-orbit misalignment in the x-ray binary MAXI J1820+070.35201859 · Poutanen, Juri, Veledina, Alexandra, Berdyugin, Andrei V et al.2022 · 44 citationsScience (New York, N.Y.). 2022;375(6583):874-876
Promise of persistent multi-messenger astronomy with the blazar OJ 2872112.10102v2 · Mauri J. Valtonen, Lankeswar Dey, A. Gopakumar et al.2021 · 31 citationsarXiv
GRB 191016A: A highly collimated gamma-ray burst jet with magnetised energy injection2111.09123v1 · M. Shrestha, I. A. Steele, S. Kobayashi et al.2021 · 8 citationsarXiv
Spitzer Observations of the Predicted Eddington Flare from Blazar OJ 2872004.13392v1 · Seppo Laine, Lankeswar Dey, Mauri Valtonen et al.2020 · 79 citationsarXiv
Characterization of a dual-beam, dual-camera optical imaging polarimeter2004.07595v1 · Manisha Shrestha, Iain A. Steele, Andrez S. Piascik et al.2020 · 32 citationsarXiv
Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC2001.01643v3 · V. A. Acciari, S. Ansoldi, L. A. Antonelli et al.2020 · 48 citationsMonthly Notices of the Royal Astronomical Society, Volume 492, Issue 4 (2020), p.5354-5365
Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-20171910.03609v2 · F. D'Ammando, C. M. Raiteri, M. Villata et al.2019 · 29 citationsarXiv
Accretion Disk Parameters determined from the great 2015 flare of OJ 2871907.11011v2 · Mauri J. Valtonen, Staszek Zola, Pauli Pihajoki et al.2019 · 37 citationsarXiv
The Unique Blazar OJ 287 and its Massive Binary Black Hole Central Engine1905.02689v1 · Lankeswar Dey, Achamveedu Gopakumar, Mauri Valtonen et al.2019 · 51 citationsarXiv
RINGO3 polarimetry of the Type I superluminous SN 2017egm1811.02038v1 · J.R. Maund, I. Steele, H. Jermak et al.2018 · 19 citationsarXiv
High accuracy measurement of gravitational wave back-reaction in the OJ287 black hole binary1810.00566v1 · Mauri J. Valtonen, L. Dey, R. Hudec et al.2018 · 8 citationsarXiv
The extreme HBL behaviour of Markarian 501 during 20121808.04300v2 · M. L. Ahnen, S. Ansoldi, L. A. Antonelli et al.2018 · 85 citationsA&A 620, A181 (2018)
Multi-wavelength characterization of the blazar S5~0716+714 during an unprecedented outburst phase1807.00413v1 · M. L. Ahnen, S. Ansoldi, L. A. Antonelli et al.2018 · 53 citationsAstronomy & Astrophysics 619, A45 (2018)
The First Post-Kepler Brightness Dips of KIC 84628521801.00732v1 · Tabetha S. Boyajian, Roi Alonso, Alex Ammerman et al.2018 · 56 citationsarXivon Valency
Blazar spectral variability as explained by a twisted inhomogeneous jet.29211720 · Raiteri, C M, Villata, M, Acosta-Pulido, J A et al.2018 · 198 citationsNature. 2017;552(7685):374-377
Optical Polarimetry of KIC 8462852 in May-August 20171709.06061v1 · I.A Steele, C.M. Copperwheat, H.E. Jermak et al.2017 · 3 citationsarXiv
Stochastic modeling of multiwavelength variability of the classical BL Lac object OJ 287 on timescales ranging from decades to hours1709.04457v2 · A. Goyal, L. Stawarz, S. Zola et al.2017 · 80 citationsarXiv
Polarimetry and Photometry of Gamma-Ray Bursts with RINGO21706.03974v1 · I. A. Steele, D. Kopac, D. M. Arnold et al.2017 · 34 citationsarXiv
Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 20151610.09416v2 · M. L. Ahnen, S. Ansoldi, L. A. Antonelli et al.2016 · 49 citationsA&A 603, A29 (2017)
The perihelion activity of comet 67P/Churyumov-Gerasimenko as seen by robotic telescopes1610.06407v1 · Colin Snodgrass, Cyrielle Opitom, Miguel de Val-Borro et al.2016 · 29 citationsMNRAS 462, S138 (2016)
The RINGO2 and DIPOL Optical Polarisation Catalogue of Blazars1608.08860v1 · H. Jermak, I. A. Steele, E. Lindfors et al.2016 · 52 citationsMNRAS (November 11, 2016) 462 (4): 4267-4299
LOTUS: A low cost, ultraviolet spectrograph1605.08238v1 · I. A. Steele, J. M. Marchant, H. E. Jermak et al.2016 · 7 citationsarXiv
Primary black hole spin in OJ287 as determined by the General Relativity centenary flare1603.04171v1 · M. J. Valtonen, S. Zola, S. Ciprini et al.2016 · 147 citationsApJ, 819, L37 (2016)
IO:I: A Near-Infrared Camera for the Liverpool Telescope1507.00906v2 · Robert Barnsley, Helen Jermak, Iain Steele et al.2015 · 22 citationsarXiv
Career total: at least 135 works. 48 are in this corpus.
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