nmlaw

About Nicholas Law

Physics and Astronomy

Rotation and flares in Evryscope-detected active cool dwarfs

EvryFlare II: Rotation Periods and Starspot Coverage of Cool Active Stars Throughout the Spin-down Process (AJ, submitted)

Ward S. Howard, Hank Corbett, Nicholas M. Law, Jeffrey K. Ratzloff, Amy Glazier, Octavi Fors, Daniel del Ser, Joshua Haislip

 

By |August 9th, 2019|Categories: Uncategorized||0 Comments

Three new Evryscope papers!

EvryFlare I: Long-term Evryscope Monitoring of Flares from the Cool Stars Across Half the Southern Sky (submitted to AJ)
Howard, Ward S.; Corbett, Hank; Law, Nicholas M.; Ratzloff, Jeffrey K.; Glazier, Amy L.; Fors, Octavi; del Ser, Daniel; Haislip, Joshua

Variables in the Southern Polar Region Evryscope 2016 Dataset (accepted to PASP)
Ratzloff, Jeffrey K.; Corbett, Henry T.; Law, Nicholas M.; Barlow, Brad N.; Glazier, Amy; Howard, Ward S.; Fors, Octavi; del Ser, Daniel; Trifonov, Trifon 

Building the Evryscope: Hardware Design and Performance (accepted to PASP)
Jeffrey K. Ratzloff, Nicholas M. Law, Octavi Fors, Henry T. Corbett, Ward S. Howard, Daniel del Ser, Joshua Haislip

By |May 11th, 2019|Categories: Uncategorized||0 Comments

Evryscope @ AAS Winter 2019

The Evryscope team and collaborators are presenting talks and posters about Evryscope science results and papers at the AAS winter meeting:

Overview project-status and science-result iPoster, viewable every day in the poster sessions (official session is Wednesday evening), and online.

10am Tuesday (Terrestrial Planets and Habitability; 203.01):

Evryscope flares as probes of the space weather environments of Proxima b and the nearest rocky exoplanets (Ward Howard)

Tuesday posters (Extrasolar Planets: Characterization & Theory; 247.05):

Evryscope and K2 Constraints on TRAPPIST-1 Superflare Occurrence and Planetary Habitability
(Amy Glazier)

Wednesday posters (Surveys and Large Programs; 363.11):

All-sky rapid transient searches with the Evryscope network (Hank Corbett)

Wednesday posters (Variable Stars; 360.16):

Evryscope Observations of Post-Common-Envelope Hot Subdwarf Systems (Kyle Corcoran)

2pm Thursday (Extrasolar Planets: Detection – Transit and Microlensing Searches):

Fast Cadence Planet-searches with the All-sky, Gigapixel-scale Evryscope (Jeffrey Ratzloff)

Thursday posters (Stars In All Their Glory; 464.03):

Evryscope Photometry of the New Hot Subdwarf Reflection Effect Binary EC 01578-1743 (Stephen Walser)

By |January 7th, 2019|Categories: Uncategorized||0 Comments

Northern Evryscope deployed!

We’ve completed a successful deployment of the Northern Evryscope. The system is currently undergoing commissioning.

By |October 27th, 2018|Categories: Uncategorized||Comments Off on Northern Evryscope deployed!

New Evryscope paper: long-term K2 target chacterization

Evryscope measured the rotation period of K2-3, a planet-host with too long a rotation period to be measured directly in K2 (or eventually TESS) data. We’re happy to provide data for astronomers interested in similar measurements of other targets.

By |October 7th, 2018|Categories: Uncategorized||0 Comments

New Evyscope paper: characterizing a young quadruple system

Evryscope helped characterize a young, eccentric and quadruple stellar system, detecting starspot rotational modulation (a clear detection at the 4mmag level!)

 

By |September 7th, 2018|Categories: Uncategorized||0 Comments

Astrobites covers the Proxima Superflare

Astrobites has a superb writeup of the Proxima superflare, written by Daniel Berke @ Swinburne!

 

By |April 12th, 2018|Categories: Uncategorized||0 Comments

Media coverage of the Proxima Superflare

There’ve been great articles on the Proxima superflare detected by the Evryscope, here’s a selection:

Space.com

Ars Technica

Universe Today

New Scientist

Outer Places

Daily Mail

El Pais

By |April 11th, 2018|Categories: Uncategorized||0 Comments

Evryscope detects a superflare from Proxima Centauri

The Evryscope has detected a superflare that briefly made the tiny star Proxima Centauri, the nearest star to our Sun, 70x brighter. Proxima b is a terrestrial-mass planet in the habitable-zone of Proxima Centauri. Proxima Centauri’s high stellar activity however casts doubt on the habitability of Proxima b: sufficiently bright and frequent flares may destroy the planet’s ozone layer, allowing lethal levels of UV flux to reach its surface. In March 2016, the Evryscope observed the first naked-eye-visible superflare detected from Proxima Centauri.

Proxima increased in brightness by a factor of ~68 during the superflare, reaching a brightness just visible to the naked eye at dark sites (and easily seen with binoculars, if someone was looking in the right direction). It’s probably worth mentioning that some people on Twitter have misinterpreted our paper to suggest that we’re claiming this event would have been easily visible to most people at most sites — which it would not have been, and which don’t claim in the paper. We just use “naked-eye” as a compact way to say the event reached a brightness in visible-light that can be detected by the human eye without optical aids under ideal conditions, to give an idea of how bright it was compared to most astronomical events.

Our statistics suggest that Proxima produces a superflare around five times a year — and some of those flares would be even brighter than the one we saw, perhaps even to the level that they could be easily visible to many people around the world. So there’s a (very) small chance that if you’re in the Southern Hemisphere and look up at Proxima Centauri, you could see a superflare going off!

In our paper, we show that the repeated flaring is sufficient to reduce the ozone of an Earth-like atmosphere by 90% within five years. We estimate complete depletion occurs within several hundred kyr. The UV light produced by the Evryscope superflare reached the surface with ~100x the intensity required to kill simple UV-hardy microorganisms, suggesting that life would struggle to survive in the areas of Proxima b exposed to these flares.

 

Above: the Evryscope discovery of the first naked-eye superflare from Proxima Centauri. Proxima got 35x brighter in a single Evryscope two-minute exposure; over the shorter timescale of the human eye Proxima increased in brightness by a factor of ~70x.

By |April 9th, 2018|Categories: Uncategorized||Comments Off on Evryscope detects a superflare from Proxima Centauri

Evryscope @ 2018 Winter AAS conference

The Evryscope team is presenting a variety of results at the Winter AAS conference in Washington DC:
Talks

Evryscope project overview Nicholas Law NSF Fellows Workshop, Monday
Fast cadence planet-searches with the all-sky, gigapixel-scale Evryscope Jeff Ratzloff 204.05, Detection of Extrasolar Planets II, Wednesday
Rapid All-Sky Transient Discovery and Analysis with Evryscope Hank Corbett Surveys and Large Programs I, 231.06, Wednesday
Stellar activity for every TESS star in the Southern sky Ward Howard Extrasolar Planets V, 310.03, Thursday


Posters

Updated O-C Diagrams for Several Bright HW Vir Binaries Observed with the Evryscope Kyle Corcoran & Brad Barlow Tuesday, 150.23
The Evryscopes: monitoring the entire sky for exciting events Nicholas Law Thursday, 354.12

 

By |January 9th, 2018|Categories: Uncategorized||0 Comments

Evryscope project update

Two project update posters from the Know Thy Star, Know Thy Planet conference at Pasadena, including the first flare-rate and exoplanet habitability constraints from the Evryscope.

By |October 12th, 2017|Categories: Uncategorized||0 Comments

Evryscope @ Keele Transiting Planets Conference

An update on the Evryscope survey at the Keele Transiting Planets conference.
By |July 17th, 2017|Categories: Uncategorized||0 Comments

Evryscope-North parts arrive

The first Evryscope-North parts have been completed at the UNC machine shop. With a couple of dozen cameras, there are a lot of components!

 

By |June 2nd, 2017|Categories: Uncategorized||0 Comments

Evryscope @ Radio Exploration of Planetary Habitability

The Evryscope team and collaborators presented Evryscope flare-search results at the AAS Radio Exploration of Planetary Habitability in Palm Springs.

Ward Howard: Evryscope flare-detection poster

Marin Anderson: Long-Wavelength-Array / Evryscope CME-detection talk

By |May 19th, 2017|Categories: Uncategorized||0 Comments

Evryscope seminar @ IAS

Nick Law presented an informal IAS @ Princeton seminar about the Evryscope and Robo-AO, with updates on some of the results so far from our various science programs. The PDF version is here.

By |May 6th, 2017|Categories: Uncategorized||0 Comments

Evryscope-North construction begins

evryscopes

We have started ordering the components of the Evryscope-North! The telescope will be based at the Mount Laguna Observatory (MLO). The Evryscope-North is funded by a collaboration of San Diego State University (SDSU), UNC-Chapel Hill  and the Research Corporation Scialog program.

Together with Evryscope-South, Evryscope-North will provide all-sky monitoring of essentially every object brighter than 16th magnitude . The two Evryscopes overlap in field of view, allowing truly-simultaneous multi-site multi-color observations over thousands of square degrees.

We expect to deploy the Evryscope-North at MLO in the summer of this year.

By |January 20th, 2017|Categories: Uncategorized||0 Comments

Added new results and status page to the website

We’ve added some updates on our current results and status to this page.

By |January 2nd, 2017|Categories: Uncategorized||0 Comments

Evryscope at AAVSO conference

We are excited to present the Evryscope project at the AAVSO annual meeting, where Octavi Fors will discuss our Scialog-funded plans for amateur observers to follow-up Evryscope discoveries.

By |November 20th, 2016|Categories: Uncategorized||0 Comments

Evryscope invited talks

We’re presenting the Evryscope at an invited talk @ the SRK60: Compact, Cataclysmic and Catastrophic workshop, and two invited talks at the Scialog Fellows Conference.

By |October 5th, 2016|Categories: Uncategorized||0 Comments

Presentations at SPIE Astronomy & Telescopes @ Edinburgh

We are presenting new Evryscope results in two presentations at the SPIE conference in Edinburgh:

Jeffrey Ratzloff, Nicholas M. Law, Octavi Fors, Philip Wulfken
Nicholas M. Law, Octavi Fors, Daniel del Ser, Hank Corbett, Jeffrey Ratzloff, Philip Wulfken
By |June 27th, 2016|Categories: Uncategorized||0 Comments