Detection Techniques For Exoplanets Essay

1962 words - 8 pages

The research area of detecting exoplanets, planets outside our own solar system, is a huge area of interest and funding. The importance of being able to detect these planets is they can give us information and an insight into planetary formation, to help the search for ”Earth- like” planets in the habitable zone, and of course the ever-present question of extraterrestrial life. So on order to attempt to gather information about these things we must be have solid detection techniques in place for exoplanets. A few of the important methods shall be discussed here, including the radial velocity method, transit method, direct imaging and gravitational microlensing among others .
The Radial Velocity method, also known as Doppler spectroscope/method for detection of exoplanets is based on the principles that a star that has an orbiting planet will experience a gravitational force from the planet and hence move in its own small orbit in response. This will result in changes in the speed of the star as it moves towards and away from the observer i.e Earth and this shall be seen as variations in the radial velocity of the star with respect to the Earth. The radial velocity of the star can be worked out from the shifting of spectral lines in spectra of the star due to the Doppler effect and from here the variations can be determined and if they apply then the presence of an exoplanet can be confirmed.
High precision spectrometers such as HARPS are required to preform observations as very high signal to noise ratio. HARPS is a high resolution fiber-fed echelle spectrograph. To maximize the chance of detecting an exoplanet certain requirements have to be met by potential targets. The targets chosen to be studied by HARPS are selected from CORALIE planet search samples that are identified as being slowly rotating, non evolved, low activity stars with no obvious radial velocity variations at the CORALIE precision level (Udry et al. 2000). In the case of HARPS, in order to average stellar oscillations which can be a source of ”radial velocity noise” observations are meant to last 15 minutes, which are split into several exposures when needed so CCD saturation is avoided. Then the data is put through the HARPS data reduction pipeline to obtain the radial velocities from individual exposures. The pipeline is based on the cross correlation of the observed spectra with template stellar spectra, wavelength calibration with ThAr spectra and tracking instrumental drifts with simultaneous ThAr technique; the details of which can be found in Baranne et al. 1996. Then the final radial velocity can be determined by averaging multiple exposures. And fits can be made to the data to retrieve further information. The eccentricity of the planets orbit can be measured directly with this method and an estimate to the planets minimum mass also. Kepler’s 3rd law can be used to determine the planets distance from the star, as the observed period of the planets orbit around star can...

Find Another Essay On Detection Techniques for Exoplanets

Networking and Security: Protecting Sensitive Data for Organizations

1265 words - 6 pages of system resources by an unauthorized person by monitoring network traffic and audit data. The techniques employed by an Intrusion Detection System fall into two broad categories. Signature -based detection and Anomaly-based detection. • Signature-Based Detection: A signature based IDS uses a signature based database for detecting mischievous activities. Each signature represents a pattern of action which corresponds to a known attack. The

multiple object segmantation Essay

603 words - 3 pages disturbance due to devices and object itself. Segmentation of fore ground object is complex problem in computer vision. Many techniques are developed to segment the objects in given frame of image. Object detection in any video system start with localization of object in given frames. The object location may be at one place or multiple places in same frame. Once target object is localized then it is passed to recognition system for recognition of

Facial Features Detection in Colour Images Based on Skin Colour Segmentation

924 words - 4 pages In case of intelligent biometric system facial features identification is a challenging task. Facial features like eye, mouth, lip are the critical factor to express human emotion. Face and facial features detection can be implemented automatically with the help of computer, but it is difficult work. In this paper we have proposed a new frame work for a fast and efficient detection of face and facial features like eyes, nose, mouth and lip from

Heterogeneous Parallel Ensemble Classifiers for Face Detection

1254 words - 5 pages which is the first step in face identification, has significant importance in many applications. In the last two decades a number of strategies have been proposed for face detection, which falls under the following five categories: Shape-based systems, Feature-based systems, Pattern-based systems, Color-based systems and Motion-based systems. Different techniques have been used by researchers for face detection. For example, support vector machines

Uses of Nanotechnology

1968 words - 8 pages identification without antibodies, and nucleic acids. Then these methods will be analyzed for potential utility and limitations in order to provide current recommendations for the future research in nanotechnology-based diagnostics. Traditional diagnostic techniques: Isolation, growth and microscopy Traditionally, the detection of most microbial pathogens such as bacteria, fungi, protozoa and worms are determined microscopically (and usually only

Comparison between the Effect of Laplacian and High Boost Filters on Spatial Domain Watermarking

1716 words - 7 pages system characteristics to choose appropriate for resistance and transparency. These techniques generally utilize the frequency-domain characteristics to detect the most proper place to embed the watermark. These methods are commonly used in frequency domain watermarking techniques. There are several methods, which are based on probing the most suitable coefficients to embed watermark information. These methods utilize a perceptually optimal

Portable Capilary Electrophoresis Insturment

1567 words - 7 pages detection for electrophoretic microseparation techniques." The Chemical Record 12.1 (2012): 106-113. 5. Brito‐Neto, José Geraldo Alves, et al. "Understanding capacitively coupled contactless conductivity detection in capillary and microchip electrophoresis. Part 1. Fundamentals." Electroanalysis 17.13 (2005): 1198-1206. 6. Kubáň, P., Nguyen, H., Macka, M., Haddad, Paul R. and Hauser, Peter C. (2007), New Fully Portable Instrument for the Versatile

An Advanced Grammatical Evolution Approach for Intrusion Detection in Manet

1347 words - 6 pages . F. Lunt. Model based intrusion detection, in Proceedings of the 14th National Computer Security Conference, pp. 372-385, Oct. 1991. [5] Y. Zhang, W. Lee, and Y. an Huang. Intrusion detection techniques for mobile wireless networks. Wireless Networks Journal (ACM WINET), 2(5), September 2003. [6] R. Guha, O. Kachirski, D. Schwartz, S. Stoecklin, and E. Yilmaz. Case-based agents for packet-level intrusion detection in ad hoc networks. In

Wireless Technology

1670 words - 7 pages , consequently, it decreases packet lost, end to end delay and improved throughput. This paper is organized as follows: we present dynamic congestion detection techniques (section 2). In Section 3, discusses the related works. We present a method for an Adaptive Routing to find an alternate path for control the congestion in Section 4. Our NS2 simulation results confirms (section 5) that our proposed protocol has a higher packet delivery rate

object tracking

1141 words - 5 pages to abrupt motion, changing the appearance of patterns for both the objects and the scene, non-rigid object structure, occlusions and camera motion. The goal of this paper is to review various object detection and object tracking methods using background subtraction. We categorize the background subtraction methods into five groups. We describe various methods in each group in detail and give a quantitative analysis of these methods. Keywords

Quantum Limited Particle Sensing in Optical Tweezers

691 words - 3 pages sensitivity than conventional particle sensing techniques in optical tweezers systems. This paper begins by formalizing an optimal parameter estimation procedure for particle sensing based on the analysis of the spatial properties of the field scattered by a particle in an optical tweezers. We show that split detection is non-optimal and consequently propose an optimal measurement scheme based on spatial homodyne detection. The efficacy of particle sensing is evaluated using the signal-to-noise ratio (SNR) and sensitivity measures; and the efficacy of spatial homodyne detection and split detection systems are compared.

Similar Essays

Exoplanets And The Search For Life

2072 words - 9 pages Other Life in our Universe? Have you ever wondered if something living was outside of our world? Somewhere in those far-away, remote regions. Well you may be right. In this project we will be investigating exoplanets and the search for life. There are many stars in our universe, and many of them have multiple planets. These planets are also known as exoplanets/extra-planets. They may contain life. Many people are searching for life. Others

Exoplenets And The Search For Life

2363 words - 10 pages When exoplanets are found and observed they are classified into groups and subclasses. These planets can be analyzed and characterized to determine the type of planet and their atmospheric composition. Most of the time exoplanets can be grouped by their size. Exoplanets are also grouped by if the planet is in the Habitable Zone or not. The Habitable zone is a region around a star which makes the conditions suitable for water; thus having

Methods And Latest Progress On Planet Detections

1651 words - 7 pages in planetary detection. There are many methods that are used in detecting planets; these methods are very complex and require a lot of understanding, but in this paper I will try to give a brief understanding of a few of these methods along with some information of planets that have been discovered. First, there is the transit method. This is a method used by astronomers by looking for a planet moving in front of it’s star (Rodriquez). Another

Detecting New Planets Essay

758 words - 4 pages it to be caused by a planet. Also this change would have to last for the same amount of time, and have the same change in brightness, if it were the same planet crossing in front of the star. This provides an accurate detection method for finding new planets. Scientist from the University of California, Berkeley, and the University of Hawaii, Manoa, have determined that twenty percent of sun-like stars in our galaxy have planets that could