Questions tagged [light-curve]
Questions about the time-dependence of the light intensity of a celestial object or region.
41
questions
2
votes
1
answer
42
views
How do I phase fold the light curve for a variable star?
I have some observational data for a star where I've done aperture photometry to get a partial period. I understand that you need to use other techniques to estimate a period for stars whose period is ...
5
votes
1
answer
63
views
How do you tell if a variable star is periodic or not by its light curve?
I have light curves for a particular star. I'm able to construct a periodogram of the stars' light curve, a plot of the power of the light curve vs. the signal's period. For a nonperiodic but ...
1
vote
0
answers
54
views
Simulating Light Curve with the Timmer & Koenig method in Python
How to simulate the light curve using the Timmer & Koenig method in python with error bars in each counts generated by that method. I have used astro ML but I doesn't show the error in the counts. ...
0
votes
0
answers
22
views
Lightcurve Labels
I had a query regarding light curve labels. As simple as it goes we can plot time (MJD, BJD, etc) on X-axis. Also, I know we can plot magnitudes on Y-axis. Again I've seen papers showing Relative flux ...
5
votes
1
answer
109
views
Sudden spikes on the light curve of a Quasar from K2 mission
I obtained the optical light curve of 3C 273 QSO from the MAST repository off the K2 mission and plotted it by making the FITS into a CSV file through Pandas dataframe and plotting the obtained ...
2
votes
1
answer
51
views
Obtaining the Flux-Time plot for a Quasar
As a follow up question to Obtaining the Light curve of a a Quasar, I wish to know how to obtain a Light curve for a quasar observation like this data set over here.
Is there an archival repository ...
3
votes
1
answer
57
views
Obtaining the Light curve of a a Quasar
So, I am relatively comfortable with handling $\textit{FITS}$ files and hence I choose Python for the following operation.
The thing is that I need to analyse some Quasar light curves and hence I went ...
-1
votes
1
answer
64
views
How to find luminosity from a light curve? [closed]
I am currently trying to find the luminosity from the light curve. I have the data about the distance, counts/sec and the energy range in which it is measured for an object. What equation can be used ...
1
vote
0
answers
18
views
Procedure to construct a spectral energy distribution and bolometric light curve of supernovae?
Can anyone check the logic of this proposed workflow and/or point me in the direction of a guide and example to check my work?
Proposed procedure to construct a spectral energy distribution and ...
2
votes
1
answer
267
views
Binning a Phase Folded Lightcurve
How do I bin a messy phase folded lightcurve? This is one of the phase folded generated plots for a variable star. I plotted the phase using the period extracted by Lomb-Scargle Periodogram algorithm. ...
4
votes
1
answer
69
views
How much time do I have left to easily spot the recently brightened Recurrent Nova RS Ophiuchi with binoculars and mild light pollution?
Excellent answers to Binocular-friendly star map to find the Recurrent Nova RS Ophiuchi? provide some helpful maps for circa 8° FOV binoculars, but due to spatial and potential meteorological ...
3
votes
2
answers
80
views
Calibrating raw photometric measurements
So I have a photometry data sourced from Solar Mass Ejection Imager's (SMEI) server as an ‘add-on data’ for my point source of interest (a variable star) with a 104 minute cadence. However, it’s not ...
2
votes
0
answers
55
views
Should I fit a function to this lightcurve?
I am creating a light curve for the duration of a binary system in order to find out the duration of the eclipse. I am unsure as to whether to fit a function to the data (is it appropriate) as by ...
5
votes
2
answers
879
views
Confused about rubber sheet analogy!
How to resolve confusions on the rubber sheet analogy of the spacetime curvatures?
I am a newbie to spacetime curvature. I have watched several youtube videos on Einsteins GR and spacetime curvature ...
1
vote
0
answers
56
views
Using lightkurve to identify a planet
I have gotten LightKurve to work and plot a lightcurve to allow for the identification of possible transits. However is there a way I can get it to run and tell me if there is a possible transit in ...
0
votes
2
answers
1k
views
Calculate mass of exoplanet from transit method
Is there any way to calculate (or at least estimate) mass of an exoplanet from transit method? I know that mass can be calculated with radial velocity method, however I would like to create program ...
0
votes
0
answers
89
views
Binned of phase-folded light curve
How I can bin a magnitude phase-folded lightcurve? I take mean values magnitudes and it's uncertainties but this is wrong.
2
votes
1
answer
165
views
How to recognize exoplanet transit
I am using Python package lightkurve for exoplanets searching by the transit method. When I download light curve of some star and apply periodogram, I find frequency and power of periodic components ...
2
votes
1
answer
118
views
Converting Light curve to Luminosity
So I'm currently working around a specific variable star, α Ori and I want to determine it's luminosity...I do only have the light curve (driven from V-optical photometric band - Johnson V from AAVSO)....
1
vote
2
answers
66
views
How can I estimate the initial luminosity of a SNIa given initial mass of Ni-56?
The initial portion (and peak) of a SNIa's light curve is powered by the $\beta$-decay reaction:
$$ ^{56}Ni \rightarrow ^{56}Co + e^+ + \nu_e + \gamma $$
Supposing we know how much Ni-56 is created in ...
1
vote
2
answers
68
views
How Can I interpret this particular light curve without reading data on the side
There is only one dip in flux recorded. How can I interpret this particular light curve and find planetary radius
https://exo.mast.stsci.edu/exomast_planet.html?planet=55Cnce
1
vote
1
answer
625
views
Calculate depth and duration of exoplanet's transit using Python, astropy or lightkurve
I am creating a program for the analysis of exoplanets in Python using Astropy and Lightkurve libraries. I have light curve of specified star and I would like to calculate depth and duration of planet ...
5
votes
2
answers
668
views
Get orbital period of exoplanet from light curve using astropy.timeseries
I am using astropy and I would like to calculate orbital period of an exoplanet by its star's light curve. I follow tutorial in astropy docs and I use data from Kepler in Nasa Exoplanet Archive.
...
2
votes
0
answers
44
views
How to model blazar light curves
I have SED data spanning over a couple of days and I'm able to find the parameters of the SED (R, B, break energy,...) using least squares method. My question is how to model light curves (with t_acc, ...
3
votes
1
answer
119
views
Pair together light curve and radial velocity data of specified star
I would like to create a web application that works with light curves and radial velocities of stars with exoplanets. I found a NASA bulk data download with both light curves and radial velocities (it'...
1
vote
1
answer
62
views
Where can I download processed data of the Kepler telescope?
I search for lightcurve Kepler data: time $t_i$, flux $F_i$ and measurement uncertainties $\sigma_i$ I need processed data (after removing trends, normalized, etc.). Where can I find it?
2
votes
0
answers
49
views
A basic question about light curves
I'm new here, so if I've done anything wrong, please let me know.
I've been taking a look at some photometry data collected from TESS, and I encountered this light curve:
(please ignore the blue and ...
2
votes
1
answer
83
views
What are these data in light curve generator
I'm generating light curves for some variable stars on the AAVSO website (see https://www.aavso.org/lcg ) . I can choose what type of data must be plotted. Can you explain what they are?
Thank you in ...
1
vote
1
answer
103
views
Could Tabby's star be beamed by a neutron star's jet causing irregular star spots?
There have been some other questions here about what might cause the light curve dips of star KIC 8462852 as observed by Kepler Space Telescope. Here's one I haven't heard before:
Could it be that a ...
2
votes
0
answers
31
views
Finding the precession period of folded light curves
I was supposed to find the precession of a certain frequency in a time series. I tried breaking down the time series into smaller intervals and folded them over the average frequency I'm interested in....
2
votes
0
answers
76
views
Depth of primary and secondary minimum in a light curve
How can I explain approximately the same depth of primary and secondary minimum in light curve?
I observe star HD 36486. I tried filters MOST and BRITE.
Is it related with photometric filter? When ...
0
votes
1
answer
84
views
Plot SuperWasp Lightcurves
I am trying to plot superwasp lightcurves in python from the fits files, using TMID and FLUX2, getting this:
There is a way to transform the information so I can plot the lightcurves with the kepler ...
1
vote
0
answers
42
views
How to decide which part of the data is analyzed? [closed]
I need to get the X-ray light curve of Classical Nova V1494 Aquilae (1999 No. 2) in Outburst. It is done long time ago, but I need to this by myself. While reading the papaer about the V1494 Aquilae, ...
4
votes
1
answer
147
views
Comprehensible full manual for bolometric light curve reconstruction
Could anyone point me to some manual or tutorial, possibly step-by-step one, on reconstruction of (quasi-) bolometric light curve using UBVRI-photometry data?
Both links and names are fine for me.
4
votes
2
answers
124
views
Classification and discovery of stars
How do astronomers find the difference between a 'Cephid Variable Star' and distinct normal stars with opaque objects blocking it's light, like stars with planets revolving around them while both ...
2
votes
0
answers
152
views
Sinusoidal Light curve of an eclipsing binary [closed]
This light curve seems really weird to me, I'm used to seeing light curves where the barycenter is a straight line. It either stays at a place, moves at a constant speed or slowly increases its speed. ...
2
votes
2
answers
1k
views
Python: Find brightest pixel in fits-file and ignore brighter artefacts
I have 4000 fits-files images from SPITZER, each containing the same star over a time period. Each image is a photmetry cube of 32 pixel * 32 pixel * 64 consequent time frames. I need to look through ...
3
votes
0
answers
308
views
How does the size of a naked black hole effect its photon sphere?
What effect does the size of a black hole have on the size or density of the photon sphere and it's proximity to the horizon?
For example: A person is in space looking at 2 black holes, one of them ...
1
vote
0
answers
179
views
Photometry data from Gaia
I am trying to get data from Gaia. Especially for Cepheids or RR Lyrae. On Gaia websites it say they have released some of the data however I cannot find it. I am looking for two columns with time and ...
1
vote
0
answers
85
views
Where can I find detail on interpreting the exo-planet transit-data graphics used in the Zooniverse Project?
I'm participating in the Zooniverse Exoplanet-explorers project (transit method), which provides only minimal guidance on interpreting their light curve and transit data graphics, as visible here:
...
5
votes
1
answer
155
views
What caused instant jumps and exactly flat periods in Kepler's light curves?
Last 65 days of Kepler's light curve for the infamous KIC 8462852 star is shown below from the published paper's graph. Skip the dips here, I wonder about two other features:
Day 1559, during a ...